flat相关字句用法：
1. flat 扁平
eg.My car has a flat/ My car has a flat tire
2. flat tire 轮胎没有气
3. flat as a pancake 如薄饼一样平
4. flathead 平头，不太聪明
eg. Hey Rich he is a flathead
5. flat out 完全,彻底的
eg. He is flat out broke. 他完全破产了。
6. fell flat on his face 脸朝下摔倒
7. flat on his butt 臀部着地摔倒
8. flat broke 破产
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