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重点讲解：
1. fall off 掉下；
When you are learning to ride a bicycle, you often fall off.
初学骑自行车时，常会从车上掉下来。
2. rather than 而非；胜于；而不是；
You are buying direct, rather than through an agent.
你这是直接购买，而不是通过代理人。
3. go up 上涨，上升；
Then Jobic saw that the bottom of the sea was beginning to go up like a hill.
然后若比看见海底像小山一样上升。
4. look at 看，瞧，望；
Isn't it fantastic? Just look at that!
这是不是棒极了？看看那个！
n. 赛跑的人，跑步者
