tightening

例句：

1. 1. The screws are tightening the bolts together.
   螺丝正在将螺栓紧固在一起。
2. 2. He tightened the bolts on the door to make it more secure.
   他拧紧了门上的螺栓，使其更加安全。
3. 3. The tension in the wire is increasing as the weight is lifted.
   随着重量的抬起，电线中的张力正在增加。