重点讲解：
1. a couple of 两个；几个；
例句：Dave, the pianist, played it over a couple of times.
演奏钢琴的戴夫将这支曲子反复弹了两三遍。
2. either...or... （表示在两者或多者中择其一）或者，要么；
例句：Either she goes or I go.
要么她走，要么我走。
3. be able to do sth. 能做到…的；
例句：She was able to keep her head in the crisis.
她在这次危机中保持了清醒的头脑。
4. move around 持续换工作；经常搬迁；
例句：I was born in Fort Worth but we moved around a lot and I was reared in east Texas.
我出生在沃思堡，但由于常搬家，所以我是在得克萨斯州的东部长大的。
