flatten out

例句：

1. 1. Thecar was flattened by the impact.
   汽车被撞击后变形了。
2. 2. The floorneeds to be flattened out beforewe start painting.
   在我们开始粉刷之前，地板需要平整。
3. 3. The snow hasflattened out on the roof.
   雪已经把屋顶压平了。