重点讲解：
1. in the middle of 中部；中央；中间；
例句：Howard stood in the middle of the room sipping a cup of coffee.
霍华德站在房间中央，小口抿着一杯咖啡。
2. because of 因为；由于；
例句：He had given up his job because of failing health.
由于体质衰弱他放弃了工作。
3. no matter 不管…；无论…；
例句：No matter what happens, Gill always looks on the bright side.
无论发生什么事，吉尔总是乐观的。

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