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重点讲解：
1. fall off 脱落；掉落；
例句：Mary scrape her knee when she fall off her bike.
玛丽从脚踏车上摔下来擦伤了膝盖。
2. run away 离开；逃离；躲开；
例句：The fox ran away before the hunter shot it.
那只狐狸在猎人向它射击前跑掉了。
3. tie up 将(动物)拴牢；把…系牢；
例句：They dismounted, tied up their horses and gave them the grain they had brought.
他们下了马，把马拴起来，把带来的粮食喂给它们吃。
4. feel bad about 抱歉的；难过的；内疚的；
例句：I feel bad about losing your dictionary.
我很抱歉把你的字典丢失了。
n. 比赛，竞争，竞赛
