pulley mortise

例句：

1. 1.The engineer used a bolt to secure the machine.
   工程师用螺栓将机器固定。
2. 2.The wedge was used to pry open the door.
   楔子被用来撬开门。
3. 3. The bolts were tightened to hold the roof in place.
   螺栓被拧紧以固定屋顶。