描述
开 本: 16开纸 张: 胶版纸包 装: 平装-胶订是否套装: 否国际标准书号ISBN: 9787302516972丛书名: 计算机系列教材
按计算机的知识结构层次编写。内容涵盖以下三个部分：计算机和计算机网络硬件结构、计算机软件和因特网应用。
尽量吸取*的技术和知识，包括云计算、大数据、3D打印技术、工业4.0和慕课等。鉴于因特网应用发展异常迅猛，本书有约三分之一的篇幅是讲述因特网应用的。
书中对一些较难翻译和理解的句子、单词进行了注释；每一节后面列出关键词汇，给出联系题；书后还给出参考译文，供读者参考。
为便于读者阅读，书中对一些较难理解和翻译的句子做了注释，对涉及的专业术语也都做了解释。
本书主要用作大学计算机及相关专业本科生、专科生的教材，也可供研究生及参加计算机水平考试的考生使用。
PART Ⅰ COMPUTER ARCHITECTURE
AND COMPUTER NETWORK
CHAPTER 1 COMPUTER ORGANIZATION AND UNITS 3
1.1 COMPUTER ORGANIZATION 3
1.2 MICROPROCESSOR AND SYSTEM BOARD 10
1.3 MEMORY 15
1.4 SECONDARY STORAGES 19
1.5 INPUT AND OUTPUT DEVICES 22
CHAPTER 2 SYSTEM SOFTWARE 27
2.1 WINDOWS 10 27
2.2 UNIX AND LINUX 32
2.3 ANDROID 37
CHAPTER 3 COMPUTER NETWORK 42
3.1 LOCAL AREA NETWORKS (LANs) 42
3.1.1 ETHERNET 42
3.1.2 WI-FI AND BLUETOOTH 46
3.2 THE INTERNET 51
PART Ⅱ INTERNET APPLICATIONS
CHAPTER 4 TRADITIONAL INTERNET APPLICATIONS 61
4.1 OVERVIEW OF WORLD WIDE WEB (WWW) 61
4.1.1 ABOUT WWW 61
4.1.2 SEARCH ENGINES 65
4.2 E-MAIL 67
4.3 ELECTRONIC COMMERCE AND THE INTERNET OF THINGS 70
4.3.1 ELECTRONIC COMMERCE 70
4.3.2 INTERNET OF THINGS 74
CHAPTER 5 NEW INTERNET APPLICATIONS 79
5.1 INSTANT MESSAGING (IM) 79
5.1.1 QQ 79
5.1.2 FACEBOOK 82
5.1.3 TWITTER 85
5.1.4 WECHAT 87
5.2 SOCIAL NETWORKING SERVICE (SNS) 90
5.2.1 WIKI 90
5.2.2 BLOG AND MICROBLOG 92
5.3 CLOUD COMPUTING 96
5.4 BIG DATA 104
PART Ⅲ PROGRAMMING LANGUAGES AND DATABASES
CHAPTER 6 PROGRAMMING LANGUAGES 113
6.1 C, C , AND C# 113
6.2 JAVA 117
6.3 MARKUP AND SCRIPTING LANGUAGES 121
CHAPTER 7 DATABASE 128
7.1 DATABASE CONCEPTS 128
7.2 THE WEB AND DATABASES 133
PART Ⅳ APPLICATION SOFTWARE
CHAPTER 8 OFFICE AUTOMATION SOFTWARE 141
8.1 THE BASICS OF OFFICE AUTOMATION SOFTWARE 141
8.2 MICROSOFT OFFICE 2013 147
CHAPTER 9 MULTIMEDIA 152
9.1 MULTIMEDIA AND ITS MAJOR CHARACTERISTICS 152
9.2 USAGE/APPLICATION 155
CHAPTER 10 COMPUTER GRAPHICS AND IMAGES 161
10.1 THE VARIOUS COMPUTER GRAPHICS 161
10.2 GRAPHICS SOFTWARE (1) 165
10.3 GRAPHICS SOFTWARE (2) 168
CHAPTER 11 MODERN INDUSTRIAL AUTOMATION 172
11.1 USE OF CAD, CAM, AND CAE 172
11.2 3D PRINTING 175
ANSWERS TO THE EXERCISES 182
参考译文 185
第一部分 计算机体系结构和计算机网络 185
第1章 计算机组成和部件 185
1.1 计算机组成 185
1.2 微处理器和主板 187
1.3 存储器 188
1.4 二级存储器 190
1.5 输入与输出设备 191
第2章 系统软件 192
2.1 Windows 10 192
2.2 UNIX和Linux 194
2.3 安卓操作系统 195
第3章 计算机网络 197
3.1 局域网 197
3.2 因特网 199
第二部分 因特网应用 201
第4章 传统因特网应用 201
4.1 万维网概述 201
4.2 电子邮件 203
4.3 电子商务和物联网 204
第5章 因特网新应用 206
5.1 即时消息 206
5.2 社交网络服务 209
5.3 云计算 211
5.4 大数据 213
第三部分 程序设计语言和数据库 215
第6章 程序设计语言 215
6.1 C、C 和C# 215
6.2 Java 217
6.3 标记和脚本语言 218
第7章 数据库 220
7.1 数据库的概念 220
7.2 万维网与数据库 221
第四部分 应用软件 223
第8章 办公自动化软件 223
8.1 办公自动化软件基本知识 223
8.2 微软Office 2013 224
第9章 多媒体 226
9.1 多媒体及其主要特点 226
9.2 多媒体应用 227
第10章 计算机图形图像 228
10.1 各种各样的计算机图形 228
10.2 图形软件（1） 229
10.3 图形软件（2） 230
第11章 现代工业自动化 231
11.1 CAD、CAM、CAE的应用 231
11.2 3D打印 233
BIBLIOGRAPHY 235
计算机英语实用教程（第五版）
目录
《计算机英语实用教程（第四版）》出版八年以来，计算机和因特网又出现了很多新技术，为了适应这种新的形势，编写了第五版。第五版只保留了第四版中计算机和网络的基础内容，超过80%是新内容。考虑到长期使用本书的教师和读者的用书习惯，本书编写格式与第四版保持一致，即课文中有注释、关键词和练习题，书后附有习题答案和参考译文。
本书由刘兆毓、郑家农等编著。全书共11章，分为31节（内含38课），其中郑家农编写了第9～11章，闫金平编写了第1、3章，刘华群编写了第2、6章，武华编写了第4、8章，刘兆毓编写了第5、7章。
本书在编写过程中引用了刘艺、王春生编写的《计算机英语（第4版）》的部分内容，在此表示感谢。
由于作者水平有限，书中难免有不当之处，敬请批评指正。
编者
2019年1月于北京
NEW INTERNET APPLICATIONS
5.1 INSTANT MESSAGING (IM)
5.1.1 QQ
1. Overview of the QQ
Tencent QQ, generally referred to as QQ, is the most popular free instant messaging computer program in Mainland China. As of September 30, 2010, the active QQ user accounts for QQ IM amounted to 636.6 million, possibly making it the world’s largest online community[1]. The number of simultaneous online QQ accounts exceeded 100 million. In February 2011, QQ.com ranked 10th overall in Alexa’s internet rankings just behind Twitter ranked 9th[2]. The program is maintained by Tencent Holdings Limited (HKEX: 0700), owned in part by Naspers[3]. Since its entrance into Chinese households QQ quickly emerged as a modern cultural phenomenon, now being portrayed in popular culture[4]. Aside from the chat program, QQ has also developed many sub-features including games, virtual pets, ringtone downloads, music, shopping, blogs, microblogging, and group and voice chat etc.
The current version of QQ is QQ2010 beta2. Tencent periodically releases special versions of QQ to coincide with events such as the Olympics or Chinese New Year.
The official client runs on Microsoft Windows and a beta public version was launched for Mac OS X version 10.4.9 or newer[5]. The Web versions, WebQQ (full version) and WebQQ Mini (Lite version), which makes use of Ajax, are currently available[6].
As of January 2015, there are 829 million active QQ accounts, with a peak of 176.4 million simultaneous online QQ users.
2. QQ International
(1) Windows
In 2009 QQ began to expand its services internationally with its QQ International client for Windows distributed through a dedicated English-language portal.
QQ International offers non-Mandarin speakers the opportunity to use all the features of its Chinese counterpart to get in touch with other QQ users via chat and videocalls, it provides a non-Mandarin interface to access Qzone, Tencent’s social network[7]. The client supports English, French, Spanish, German, Korean, Japanese and traditional Chinese. A wealth of third-party applications is bundled with QQ International and it is mainly aimed at making cross-cultural communications in and out of China more convenient.
One of the main features of QQ International is the optional and automatic machine translation of all chats.
(2) Android
An Android version of QQ International was released in September 2013. The client’s interface is in English, French, Spanish, German, Korean, Japanese and traditional Chinese. In addition to text messaging, users can send each other images, video, and audio media messages. Moreover, users can share multimedia content with all contacts through the client’s Qzone interface.
The live translation feature is available for all incoming messages and supports up to 18 languages.
(3) iOS / iPhone
QQ International for iPhone and iOS devices was released at the end of 2013, fully equivalent to its Android counterpart.
3. Web QQ
Tencent launched its web-based QQ formally on 15 September 2009, the latest version of which being 3.0. Rather than solely a web-based IM, WebQQ 3.0 functions more like its own operating system, with a desktop in which web applications can be added.
4. Open source and cross-platform clients
Using reverse engineering, open source communities have come to understand the QQ protocol better and have attempted to implement client core libraries compatible with more user-friendly clients[8]. Most of these clients are cross-platform, so they are usable on operating systems which the official client does not support. However, these implementations had only a subset of the functions of the official client and therefore were more limited in features.
NOTES
[1]??making现在分词短语作状语；it代表 QQ，the world’s…为宾语补语。
[2]??Alexa是一家专门发布网站世界排名的网站，同时提供网站的流量、网站访问量等。Twitter（非官方称为“推特”）是一个社交网在线服务网站，有关它的内容详见5.1.3节。
[3]??Tencent Holdings Limited是中国的一家国有公司，其子公司提供因特网和移动电话的增值服务和在线广告服务。HKEX（Hong Kong Stock Exchange）为香港股市交易。Naspers是南非的一家跨国媒体公司，主营电子媒体（包括付费电视、因特网和即时消息用户平台，以及其他相关技术）和印刷媒体（包括出版、发行以及杂志、报纸和书籍的印刷，也提供私人教育服务）。
[4]??Since引导的是时间状语从句；portray，描绘。
[5]??Mac OS X是苹果电脑的操作系统。
[6]??Ajax是一组交叉式Web应用的开发方法，用于在客户端创建异步式Web应用。
[7]??长句，前半句中，第一个动词不定式to use…为定语，修饰 opportunity。后一个动词不定式 to get in…作状语。Qzone是腾讯计算机系统有限公司（港交所00700）于2005年推出的一个网志系统，目前仍活跃在中国大陆。
[8]??reverse engineering即逆向工程（又称反向工程），是一种技术过程，即对一项目标产品进行逆向分析及研究，从而演绎并得出该产品的处理流程、组织结构、功能性能规格等设计要素，以制作出功能相近，但又不完全一样的产品。
KEYWORDS
blog 博客
social network 社交网
microblogging 微博
voice chat 语音聊天
portal 门户
video call 视频呼叫
multimedia 多媒体
counterpart 副本，复本，对应物
open source 开源
cross platform 跨平台
reverse engineering 逆（反）向工程
EXERCISES
Multiple Choices
1. QQ is the most popular free instant messaging in ________.
a. Japan b. P.R.C c. Singapore d. Mainland China
2. QQ Instant Messaging ________.
a. has user accounts that exceed 600 million
b. is the world’s largest online community
c. has more than 100 million of user simultaneous on line
d. has entered into Chinese households
3. QQ has the following sub-features:________.
a. chat b. virtual pets c. games d. blogs
4. Special versions of QQ are used for coinciding with ________.
a. Christmas b. Thanksgiving Day
c. Chinese New Year d. Olympics
5. Beta public version of QQ was launched for Mac OS X version ________.
a. newer b. older c. Web QQ d. 10.4.9
6.?QQ International for Windows offers ________ speakers to use all the features of its Chinese counterpart.
a. English b. Korean c. non-Mandarin d. Mandarin
7. QQ International for Android ________.
a. has a server’s interface in Classic Chinese
b. can be used to send text messaging only
c. can be used to share multimedia content with all contacts
d. can support up to 18 languages in the live translation
8. The client core libraries are ________.
a. compatible with user-friendly clients
b. open source communities
c. cross-platforms
d. usable on operating systems which the official client does not support
9. Tencent Holdings Limited ________.
a. is a Chinese national company
b. has a branch company which offers Internet added services
c. has a branch company which offers mobile added services
d. has a branch company which offers online advertising services
10. Until now QQ International has ________.
a. a Windows version b. an Android version
c. versions for iPhone and iOS d. all the above
5.1.2 FACEBOOK
1. Features
Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook Inc. As of June 2014, Facebook has more than 1.3 billion active users. Users may create a personal profile with photo, lists of personal interests, contact information, and other personal information, add other users as friends, and exchange messages, including automatic notifications when they update their profile[1]. Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics.
Facebook has a number of features with which users may interact:
① Wall, a space on every user’s profile page that allows friends to post messages for the user to see [2].
② Pokes, which allows users to send a virtual “poke” to each other (a notification then tells a user that they have been poked)[3].
③ Photos, where users can upload albums and photos.
④ Status, which allows users to inform their friends of their whereabouts and actions.
Depending on privacy settings, anyone who can see a user’s profile can also view that user’s Wall.
On February 23, 2010, Facebook was granted a patent on certain aspects of its News Feed. The patent covers News Feed in which links are provided so that one user can participate in the same activity of another user. The patent may encourage Facebook to pursue action against websites that violate its patent, which may potentially include websites such as Twitter [4].
One of the most popular applications on Facebook is the Photos application, where users can upload albums and photos. Facebook allows users to upload an unlimited number of photos, compared with other image hosting services such as Photobucket and Flickr, which apply limits to the number of photos that a user is allowed to upload [5]. During the first years, Facebook users were limited to 60 photos per album. As of May 2009, this limit has been increased to 200 photos per album.
2. Technical aspects
Facebook is built in PHP which is compiled with HipHop for PHP, a “source code transformer” built by Facebook engineers that turns PHP into C [6]. The deployment of HipHop reportedly reduced average CPU consumption on Facebook servers by 50%.
Facebook used a combination platform based on HBase to store data across distributed machines [7]. Using a tailing architecture, new events are stored in log files, and the logs are tailed. The system rolls these events up and writes them into storage. The User Interface then pulls the data out and displays it to users. Facebook handles requests as AJAX behavior [8]. These requests are written to a log file using Scribe (developed by Facebook) [9].
NOTES
[1] 长句，主句为Users may create…，add…，and exchange…，有3个并列的谓语； including…分词短语作状语。
[2]??Wall在Facebook中是指一块可供大家在上面留言的墙。
[3]??poke，原意是“存入，插入”。此处是用手指戳戳的意思，是用来“烦”别人的。
[4] 句中有 that和 which，分别引导了定语从句和非限定性定语从句。 Twitter的解释详见5.1.3节。
[5] 长句。compared with…过去分词短语作状语；which 引导的是非限定性定语从句；that引导的是定语从句。Photobucket是美国一个影像寄存、视频寄存、幻灯片制作与照片分享的网站。Flickr，雅虎旗下图片分享网站，提供免费及付费数码照片存储、分享方案之线上服务，也是网络社群服务的平台。
[6]??PHP（Hypertext Preprocessor）即超文本预处理器，是一种通用开源脚本语言，详见6.3节。HipHop for PHP是Facebook的一个项目，它由一个PHP到C 的转换程序、一个重新实现的PHP运行库和许多常用PHP扩展的重写版本构成，目的旨在加速和优化PHP。
[7]??HBase（Hadoop Database）是一个高可靠性、高性能、面向列、可伸缩的分布式存储系统，利用HBase技术可在廉价PC Server上搭建起大规模结构化存储集群。
[8]??AJAX（Asynchronous JavaScript And XML）即异步JavaScript和XML，是指一种创建交互式网页应用的网页开发技术。
[9]??Scribe是Facebook开源的日志收集系统，在Facebook内部已经得到大量的应用。它能够从各种日志源上收集日志，存储到一个中央存储系统（可以是NFS，分布式文件系统等）上，以便于进行集中统计分析处理。它为日志的“分布式收集，统一处理”提供了一个可扩展的、高容错的方案。
KEYWORDS
profile 配置文件，概貌，轮廓
patent 专利
hosting 托管
upload 加载，上载，（向上）装入
compile 编译
consumption 消耗，耗散，消费
monolithic 单块（片）的
distributed machines 分布式（计算）机
log file 日志文件
aggregate 集合，聚集，集合的，合计的
EXERCISES
True/False
1. ________ Facebook is a social networking service.
2. ________ Users of Facebook can create a personal profile.
3. ________ Wall in Facebook is like a firewall.
4. ________ Poke in Facebook is a notification.
5. ________ With Photos of??Facebook, we can download albums and photos.
6. ________ With Status of Facebook, users can locate their friends.
7. ________ Certain aspects of Facebook’s NewsFeed are patent.
8. ________ Flickr allows users to upload unlimited number of photos.
9. ________ Facebook allows users to upload limited number of photos.
10. ________ Before 2005 Facebook users were limited to 60 photos per album.
11. ________ HipHop for PHP is a source code transformer.
12. ________ A report shows that the use of HipHop reduced average CPU consumption on Facebook servers by 40%.
13. ________ Using a tailing architecture, new events are stored in log files.
14. ________ HBase is a high reliable, high performance and resize-able distributed storage system.
5.1.3 TWITTER
Twitter is an online social networking service that enables users to send and read short 140-character messages called “tweets” [1].
Registered users can read and post tweets, but unregistered users can only read them. Users access Twitter through the website interface, SMS, or mobile device app. Twitter Inc. is based in San Francisco and has more than 25 offices around the world.
Twitter was created in March 2006. The service rapidly gained worldwide popularity, with more than 100 million users who in 2012 posted 340 million tweets per day. The service also handled 1.6 billion search queries per day. In 2013 Twitter was one of the ten most-visited websites, and has been described as “the SMS of the Internet.” As of December 2014, Twitter has more than 500 million users, out of which more than 284 million are active users [2].
1. Features
Tweets are publicly visible by default, but senders can restrict message delivery to just their followers. Users can tweet via the Twitter website, compatible external applications (such as for smartphones), or by Short Message Service (SMS) available in certain countries[3]. Retweeting is when a tweet is forwarded via Twitter by users. Both tweets and retweets can be tracked to see which ones are most popular. While the service is free, accessing it through SMS may incur phone service provider fees.
Twitter allows users to update their profile via their mobile phone either by text messaging or by apps released for certain smartphones and tablets.
As a social network, Twitter revolves around the principle of followers. When you choose to follow another Twitter user, that user’s tweets appear in reverse chronological order on your main Twitter page. If you follow 20 people, you’ll see a mix of tweets scrolling down the page: breakfast-cereal updates, interesting new links, music recommendations, even musings on the future of education.
2. Implementation
Twitter places great reliance on open-source software. The Twitter Web interface uses the Ruby on Rails framework, deployed on a performance enhanced Ruby Enterprise Edition implementation of Ruby[4].
As of April 6, 2011, Twitter engineers confirmed they had switched away from their Ruby on Rails search stack, to a Java server they call Blender[5].
The service’s application programming interface (API) allows other web services and applications to integrate with Twitter[6].
NOTES
[1]??tweet，推文，tweet 原意是小鸟啾啾地叫，此处为短小消息。
[2]??out of which，原意是出自……，which是指5亿用户。
[3]??tweet，此处为动词。 SMS(Short Message Service)，短信服务。
[4]??Ruby on Rails是一个可以使开发、部署、维护Web 应用程序变得简单的框架。 Ruby Enterprise Edition (REE)是标准Ruby（一种为简单快捷的面向对象编程而开发的脚本语言）解析器的改进版本,号称能够让Rails（是一个更符合实际需要而且更高效的Web开发框架）应用节约1/3的内存使用量，并且能更好地提高性能。
[5]??confirmed后面省略了 that，这是一个宾语从句。Blender是一款开源的跨平台全能三维动画制作软件，提供从建模、动画、材质、渲染到音频处理、视频剪辑等一系列动画短片制作解决方案。
[6] 此处 service是指 Blender。
KEYWORDS
register 注册，寄存器
post 邮政，邮寄，记入，位置
SMS(Short Message Service) 短消息服务
tweet 推文
retweet 转推文
profile 配置文件，简表，概貌，轮廓
stack 栈，堆栈
Java 一种程序设计语言
EXERCISES
Fill in the blanks with appropriate words or phrases found behind this exercises.
1. Twitter allows users to send and receive short ________ called “tweets”.
2. Unregistered Twitter users can only read ________.
3. By way of ________ users can access Twitter.
4. Senders in Twitter can ________ message delivery to just their followers.
5. In order to see which persons are most popular, we can ________ tweets and retweets.
6. Twitter places great reliance on ________ .
7. Twitter revolves around the principle of ________.
8. ________ allows other web services and applications to integrate with Twitter.
9. Ruby is an object-oriented ________ language.
10. Twitter allows users to update their ________ via their mobile phone.
a. scripting
b. API
c. 140-character messages
d. open-source software
e. website, interface, SMS, or mobile device app
f. profile
g. tweet
h. track
i. restrict
j. followers
5.1.4 WECHAT
WeChat is a mobile text and voice messaging communication service developed by Tencent in China, first released in January 2011. It is the largest standalone messaging app by monthly active users.
The app is available on Android, iPhone, BlackBerry, Windows Phone and Symbian phones, and there are also Web-based and OS X clients but these require the user to have the app installed on a supported mobile phone for authentication[1]. As of August 2014, WeChat has 438 million active users; with 70 million outside of China.
Users can register WeChat with Facebook account or sign up with phone number. WeChat currently supports phone numbers of more than 100 countries to register. Registration cannot be done directly through Tencent QQ[2]. But users can connect their WeChat account with Tencent QQ account after registering through phone number.
WeChat provides text messaging, hold-to-talk voice messaging, broadcast (one-to-many) messaging, sharing of photographs and videos, and location sharing. It can exchange contacts with people nearby via Bluetooth, as well as providing various features for contacting people at random if desired and integration with social networking services such as those run by Facebook and Tencent QQ[3]. Photographs may also be embellished with filters and captions, and a machine translation service is available.
WeChat supports users to register as a public account, which enables them to push feeds to subscribers, interact with subscribers and provide them with service[4]. By the end of 2014, number of Wechat public accounts had reached 8 million.
In China, Wechat public accounts have become a common service or promotion platform for government, news media and companies. Specific public account subscribers use the platform for services like hospital pre-registration, visa renewal or credit card service.
On 30 September 2014, WeChat 6.0 was launched with new features and functions include Sight capture and share.
According to GlobalWebIndex, WeChat is the fifth most used smartphone app worldwide and in August 2013, following Google Maps, Facebook, YouTube and Google [5]. WeChat claimed it had 100 million registered international users which are achieved in only 3 months from 50 million registered international users. It also claimed 300 million registered Chinese users.
According to Xinhua, WeChat total users reached 600 million users worldwide in October 2013. In addition, approximately 30 percent of the total WeChat are users abroad.
NOTES
[1]??由 and连接的并列句，前一句中的 The app是指前一段中的 the largest standalone messaging app，即 WeChat，后一句中 there are…省略了to be used by the app。 Android见2.3节。 BlackBerry，加拿大RIM(Research In Motion Ltd)公司生产的黑莓手机。Windows Phone（WP）是微软发布的一款手机操作系统，它将微软旗下的Xbox Live游戏、Xbox Music音乐与独特的视频体验集成至手机中。
Symbian系统是塞班公司为手机而设计的操作系统。
[2]??Tencent QQ，腾讯 QQ，详见5.1.1节。
[3]??长句。It代表WeChat。句子最后的run by…过去分词短语，修饰those。Facebook，详见5.1.2节。
[4]??push feeds在SNS和微博中都要用到feed，在微信中feed也指每条微信里的新鲜事物。在feed 架构中要用到推（push）拉（pull）模式。其中 push模式是把一篇微信推送给所有关注的人。
[5]??Global WebIndex是一个市场研究公司，其业务主要是向广告行业提供客户数据。Google Maps（谷歌地图）是谷歌提供的电子地图服务，包括局部详细的卫星照片。此款服务可以提供含有行政区和交通以及商业信息的矢量地图、不同分辨率的卫星照片和可以用来显示地形和等高线地形的视图。You Tube是一个共享视频的网站，该网站2006年11月被谷歌公司收购，现为谷歌公司的一个子公司。Google 即 Google Plus，一个社交网络和为谷歌服务的社区。
KEYWORDS
WeChat 微信
message 消息，信息，电文
register 注册，寄存器
sign up 签约，参加，入队
text messaging 文本消息
broadcast 广播
photograph 照片，相片
video 视频
Bluetooth 蓝牙
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