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重点讲解：
1. rely on 依赖；依靠；
The industry relies on the price of raw materials remaining low.
这一产业靠的是原料便宜，不涨价。
2. stem from 起源于；来自；由…造成；
All my problems stem from drink.
我所有的问题都源于酗酒。
3. bump into 偶然遇见；意外碰到；
I happened to bump into Mervyn Johns in the hallway.
我在走廊里意外碰见了默文·约翰斯。
4. be scared to do sth. 惊恐的；恐惧的；害怕的；
I had white rugs on the floor, but people were scared to tread on them in case they marked.
我在地板上铺了白色小地毯，但大家都不敢往上踩，以免在上面留下脚印。
adj. 各种各样的 动词vary的过去式和过去分词
