重点讲解：
1. take apart 拆开；拆散；拆解；
例句：When the clock stopped, he took it apart, found what was wrong, and put the whole thing together again.
钟停以后，他把它拆开，查出毛病所在，又把它重新组装了起来。
2. fall asleep 入睡；睡着；进入梦乡；
例句：He was so tired that he fell asleep quickly.
他非常疲劳，很快就睡着了。
3. work up 使(自己)心烦意乱(或气愤)；
例句：She worked herself up into a bit of a state.
她把自己弄得有点儿紧张。
4. be aware of 知道的；明白的；
例句：She was well aware of the difficulties that had to be surmounted.
她很清楚必须克服哪些困难。
5. on top of 另外；加之；除…之外(还)；
例句：He gets commission on top of his basic salary.
他除了基本薪资还可以得到佣金。
