底面

例句：

1. 1. The car's bottom is dented from the collision.
   这辆车的底部因为碰撞而凹陷。
2. 2. The table has asmooth, polished surface.
   桌子的表面光滑、光亮。
3. 3. The engineer carefully inspected the bottomof the ship to ensure it was structurally sound.
   工程师仔细检查了船的底部，确保其结构稳固。