重点讲解:
1. a couple of 两个;几个;
例句:He gave a couple of loud rings on the doorbell.
他使劲地按了几下门铃 。
2. get used to sth./doing sth. 开始习惯于;
例句:I've got used to being a vegetarian.
我已经习惯吃素食 。
3. fall off 脱落,掉落;
例句:To my great amusement his false beard fell off.
使我感到极其好笑的是他的假胡子掉下来了 。
4. keep on 重复;继续;
例句:She kept on working although she was tired.
她虽疲劳但仍继续工作 。
adj. 紧张的,压力重的