flat conveyor belt

例句：

1. 1. The table is very flat and easy to clean.
   这张桌子非常平坦，容易清洁。
2. 2. The floor is flat and smooth.
   地板是平坦光滑的。
3. 3. The car is flat with no bumps or dips.
   这辆车平坦，没有颠簸或凹陷。