When was it invented?

本单元的话题是“发明”，涉及科普知识与技术等内容，是学生最感兴趣的话题之一。写作体裁多为说明文，写好这类文章一定要抓住事物的特征、功能和用途。

写作此类话题作文的常用表达有：

(1) When was …invented?

(2) It was invented…

(3) They are used for…

【典型例题】

计算机在我们的生活、工作中的作用越来越大，你知道计算机的起源与发展吗？请结合计算机的发明时间（1946年）、外形、用途等方面，谈一下它的发展变化，并说明你对未来计算机的畅想。

【优秀范文】

Computer

Computers are becoming more and more important in our daily life. Do you know when the computer was invented?

The computer was invented in 1946. At that time, it was huge. With the development of science and technology, the computer has grown smaller. Now there are many kinds of computers, such as personal computers and laptops. The computer is a very useful tool in our life. For example, it can send some messages to foreign friends by email. What’s more, it can share information with others through the World Wide Web. We can also listen to music or play the game on computers. It makes us relax.

It’s hard to imagine what our life would be like without computers. I think computers will be more convenient and they are going to change our life completely in the near future.

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作文地带知识拓展:

• Computer  uk  /kəmˈpjuː.tər/ us  /kəmˈpjuː.t̬ɚ/

  An electronic machine that is used for storing, organizing, and finding words, numbers, and pictures, for doing calculations, and for controlling other machines

  计算机，电脑

  a personal/home computer

  个人／家用电脑

  All our customer orders are handled by computer.

  我们所有顾客的订单都是用电脑来处理的。

  computer software/hardware

  电脑软件／硬件

  computer graphics

  电脑制图

  a computer program

  电脑程序



• 电脑的学名叫电子计算机（computer），是一种利用电子学原理根据一系列指令来对数据进行处理的设备。电脑由美籍-匈利亚人约翰·冯·诺伊曼发明，是现代一种用于高速计算的电子计算机器，可以进行数值计算，又可以进行逻辑计算，还具有存储记忆功能。是能够按照程序运行，自动、高速处理海量数据的现代化智能电子设备。涉及到社会的各个领域对人类的生活产生及其重要的影响，是20世纪最先进的科学发明之一，它不仅是现代科技的重要产物，也是人们日常生活和工作中不可或缺的工具。

  电脑英文释义：

  1.computer, electronic brain, electronic computer, electron brain

  2.artificial brain

  3.electronic wizard

  4.computer modern

  电脑简写：PC

  Sitting at my desk all day long staring at a computer screen makes me feel worse in body and mind than any other activity I can think of.

  成天坐在办公桌前看电脑极其伤害身心，我都想不到有什么活动能与它的危害性相比。

• 发明[fā míng]：是应用自然规律解决技术领域中特有问题而提出创新性方案、措施的过程和成果。

  1.动词创造（新的事物或方法)。

  2.名词创造出的新事物或新方法。

  3.动词阐明（前所未知的义理）。

  英文解释：Invention