fast ening bolt

例句：

1. 1. The car was fixedwith a new fastening bolt.
   汽车被更换了一个新的紧固螺栓。
2. 2. He tightened the bolts on the door tomake sure it was secure.
   他拧紧了门上的螺栓，确保它牢固。
3. 3.The engineer used a special fastening boltto hold the machine together.
   工程师使用一种特殊的紧固螺栓来固定机器。