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重点讲解：
1. in fact 事实上，其实；
In fact, those people have been promoted.
事实上，那些人已经升职了。
2. because of 因为，由于；
His school work is suffering because of family problems.
由于家庭问题，他的学业日渐退步。
3. be able to do sth. 可以…的，能够…的；
They were able to come and go at will.
他们能够来去自由。
4. even though 即使；尽管；
It's a thrilling movie even though it lacks subtlety.
这部电影虽说不算精巧，但还是扣人心弦的。
