平底拖鞋

例句：

1. 1. The floor is flat and easy to clean.
   地板是平坦的，容易清洁。
2. 2. She put the books on the flat surface.
   她把书放在平坦的表面。
3. 3. The car was parked on a flat piece of land.
   汽车停在一块平坦的土地上。