15. When he was in college , his college was at war . 当他上大学时，他的国家正处于战争状态。
16. fall to pieces 倒塌，解体，垮台，摔碎，身体垮下来
That ancient building was falling to pieces . 那座古建筑物正在倒塌。
After the death of Napoleon , his empire began to fall to pieces . 那破仑死后，他的帝国就开始瓦解了。
These glasses have fallen to pieces . 这些玻璃杯已经摔碎。
Your father will fall to pieces if he doesn\'t stop working so hard . 如果你父亲再这样拼命干下去，他的身体回垮的。（这里 fall to pieces = break down）
No wonder the car is falling to pieces . Have you seen how he drives it ? 难怪这辆车垮了。你看到他是怎样驾驶的 ？
The rainy season lasts for six months and water gets in among the stones . 雨季长达六个月，雨水渗入石缝中。
测试要点：注意对比由动词 fall 构成的短语：fall asleep 睡着。fall behind 落后。fall down 倒塌。fall flat on one\'s face 直挺挺地面朝下跌倒。fall in 掉入。fall in love with sb 爱上某人。fall / get into the / a habit of 养成……的习惯。fall off 从……跌落。 fall on one\'s knees = go down on one\'s knees 跪下。fall / get sick = fall / get ill 生病。
17. piles of = masses of = supplies of = quantities of = lots of 很多，大量，一堆一堆的。
The study was full of piles of old books . 那个书房里堆满了一堆堆的旧书。
Piles of rubbish can be seen in that works . 在那个工厂可以看到一堆又一堆的垃圾。
18. get in 进入，收割，渗入，抵达，插入，请来
Can we get in the house by the back door ? 我们可以经过后门进入房子吗 ？
What time does the train get in ? 火车什么时间进站 ？
The peasants are busy in getting in the crops . 农民们正忙于收割庄稼。
We must get somebody in to repair the television . 我们必须请人来修理电视机。
Little Jim is always getting in a word when others are talking . 小吉姆总是在别人谈话时插嘴。
测试要点：注意理解由 get 构成的短语间意义上的区别。get get a word in = get in a word 插嘴。get about/ around / round 各处走动。get abroad 消息、谣言等的传开。get along 过活，过日，进展。get away 逃脱。get back 回来，取回，恢复。get cold = catch a cold 感冒。get down 从……下来，写下。get down to 开始认真干…… 。 get home 到家。get in / into touch with 与……取得联系。get into 进入。get into a habit of 养成干……的习惯。get into trouble 引起麻烦。get off 从……下来。get on 上车、上马、上飞机等。get ready 准备好。get rid of 摆脱。get through 结束，完成。get together 聚会。get up 起床。
19. go down to 下到，延续到，减少到
The native women go down to the river to wash clothes . 当地妇女到河里去洗衣服。
During her illness her weight went down from 50 kilos to 40 kilos . 她生病时体重由 50 公斤减少到 40 公斤。
注意 go down into 在本课是“根深深扎入”的意思。如：The roots go down into the holes between the stones .
20. devote + time / energy / oneself + to + -ing 把时间（精力）用于…… 。
He devoted 10 years to doing the research . = He spent 10 years doing the research .
Captain Cook devoted several years to charting the coasts of east America .
Lei Feng devoted all his life to serving the people .
21. lay down 安放，铺设，放下武器等。
She laid the sleeping child down on her bed .