重点讲解：
1. be based on 以…为基础；
Our relationship was based on mutual dependence.
我们的关系建立在相互依存的基础上。
2. take part in 参加；参与；
You don't need strength to take part in this sport.
参加这项运动不需要太多体力。
3. in addition 另外；加之；除…之外；
In addition, the respondent disclosed professional confidences to one of the patients.
另外，被告还向其中一位病人透露了行业机密。
4. at least （数量）至少，不少于；
It takes at least an hour to get home from work.
下班回家至少得花一个小时。

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