重点讲解：
1. on purpose 特意地；故意地；有意地；
例句：Was it an accident or did David do it on purpose?
是意外还是戴维故意所为？
2. at first 最初；起初；开始时；
例句：Dart, who had at first been very tense, at last relaxed.
起初，达特非常紧张，最后终于放松了下来。
3. turn out 原来是；结果发现；
例句：It turned out that I knew the person who got shot.
结果发现我认识那个中枪的人。
4. take away 拿走；夺走；
例句：Don't let him take away your freedom to think for yourself.
别让他夺去你独立思考的自由。

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