main bearing

例句：

1. 1. The main bearing of the machine is located in the center of the frame.
   机器的主要轴承位于框架中心。
2. 2.Main bearings are designed to withstand high loads and rotational speeds.
   主要轴承设计用于承受高负载和高速旋转。
3. 3.Main bearings must be inspected regularly to ensure they are functioning properly.
   主要轴承必须定期检查，以确保它们正常工作。