重点讲解：
1. be able to do sth. 可以…的，能够…的；
例句：e said he would look about to see who might be able to help us.
他说，他要留心看看谁能帮我们的忙。
2. in case 以备；以防；免得；
例句：We allowed a margin of twenty minutes in case the bus was late.
我们预留二十分钟宽裕时间，以防汽车晚点。
3. at least 至少；起码；
例句：We should at least lend them moral support.
我们至少要给予他们精神上的支持。
4. heat up （尤指将已经冷掉的熟食）加热；
例句：Freda heated up a pie for me.
弗蕾达为我热了一块馅饼。
