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重点讲解：
1. be based on 以……为基础；
The book is based on personal experience.
本书是根据个人经历写成的。
2. take effect 生效；
The traffic laws don't take effect until the end of the year.
交通法要到年底才生效。
3. according to 依照；按照；根据；
According to law, a doctor must be present at the ringside.
按法律规定，场边必须有一名医生。
4. withdraw from 退出(活动或组织)；
A back injury forced her to withdraw from Wimbledon.
背部受伤使她不得不退出温布尔登赛事。
n. 保护，防卫
