顶底杆

例句：

1. 1. The top and bottom of the table are made of different materials.
   桌子的顶部和底部由不同材料制成。
2. 2. The car's top and bottom parts need to be checked for wear and tear.
   汽车的顶部和底部部分需要检查磨损情况。
3. 3. The engineer carefully measured the top and bottom dimensions of the new machine.
   工程师仔细测量了新机器的顶部和底部尺寸。