高中英语学习材料（灿若寒星 *制作整理）M7 Unit 1 Reading (2) The evolution of video and sound devices （Language points）Learning Aims: 1. Improve English through doing a project. Important and difficult points: 1. Learn something about how to make a list. 2. Master the meanings and usages of some words and phrases. Learning procedures:Step 1 Remember the following important phrases. 1. shortly afterwards 不久之后2. contribute to 对 ⋯⋯ 作出贡献；促成；捐助；给⋯⋯ 写稿3. made a breakthrough in 在 ⋯⋯ 有突破4. in the late 1920s 在二十世纪二十年代晚期5.delay⋯until ⋯ 把⋯⋯ 推迟到 ⋯⋯6. in colour 彩色的7. make a recording of 录制8. wind up 上发条9. by hand 用手工10. play records 播放录音11. along with 和⋯⋯ 一道12. with the development of ⋯⋯ 随着 ⋯⋯ 的发展13. benefit from 从 ⋯⋯ 受益14. keep pace with 跟上 ⋯⋯ 步伐Step2 Word study 1. drawback n. 缺点，缺陷；不利条件This is the one major drawback of the new system. 这是新系统的一大弊端。The main drawback to it is the cost. 它的主要缺点是成本高。One drawback to living in Nanjing in summer is the heat. 夏天住在南京的一个缺点就是炎热。［注意 ］drawback 带后置定语时可以与介词of 或 to 搭配。2. principle n. 原理，法则；道德原则，行为准则I refuse to lie about it; it's against my principles. 我绝不为此事撒谎；那是违背我的原则的。We stick to the principle that everyone should be treated fairly. 我们坚持人人都应该被平等对待这一原则。I take this seriously. It's a matter of principle. 我对此很认真。这是原则问题。He doesn't do such things on principle. 他根据自己的信条，不做这类事情。They have agreed to the proposal in principle but we still have to negotiate the terms. 他们基本上同意了那项提议，但我们仍须商定条件。［知识拓展 ］on principle 出于道德准则against one’s principles 违背某人的行为准则in ...
