flat suspended main crown

例句：

1. 1. The floor is flat and easy to clean.
   地板是平坦的，易于清洁。
2. 2. The table is flat and has a smooth surface.
   桌子是平坦的，表面光滑。
3. 3. The roof of the house is flat and can be easily repaired.
   房子的屋顶是平坦的，可以容易地修复。