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重点讲解：
1. at the same time 同时；
例句：He may be very rude sometimes but at the same time he is very kind.
有时候他可能很粗鲁，然而他还是很善良。
2. because of 因为；由于；
例句：The sea was choppy today because of the windstorm.
今天起了风暴，海上波涛汹涌。
3. find out (尤指特意通过努力)发现，找出，查明；
例句：My greatest dread is that my parents will find out.
我最担心的就是父母会察觉出来。
4. depend on 取决(于)；有赖(于)；
例句：It would depend on what is on the list.
这要看列表内容。
adj. 粗鲁的，无礼的
adj. 粗糙
