flat connect

例句：

1. 1. The floor is very flat and smooth.
   地板非常平整光滑。
2. 2. The car was parked on a flat surface.
   汽车停在了一个平坦的表面。
3. 3. The table is flat enough for the guests to sit around it.
   桌子足够平坦，客人可以围坐在周围。