level tube axis

例句：

1. 1.The level tube axis is crucial for maintainingthe balance of the system.
   水平管轴线对于保持系统平衡至关重要。
2. 2. The axisof the machine runs throughthe center of the room.
   机器的轴线穿过房间的中心。
3. 3. The axis ofthe planet revolves around the sun.
   行星的轴线围绕太阳旋转。