pretightening unit sealing load

例句：

1. 1. The new design of the machine uses a pretightening unit to improve its efficiency.
   这台机器的新设计使用了预紧式单元来提高其效率。
2. 2. The engineer used a pretightening unit to tighten the bolts on the car's suspension system.
   工程师使用了一个预紧式单元来紧固汽车悬挂系统的螺栓。
3. 3. The pretightening unit was designed to minimize vibration and noise during operation.
   预紧式单元被设计成在操作过程中最小化振动和噪音。