m7 unit 1
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……
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