棘螺栓

例句：

1. 1. Thecar's engine is difficult to startwith the screws loose.
   汽车的引擎很难启动，螺丝松了。
2. 2. The constructionworkers used a bolt to secure the woodenbeam.
   建筑工人用螺栓固定木梁。
3. 3.The engineer tightened the bolts onthe machine to ensure it worked properly.
   工程师拧紧机器上的螺栓，确保它正常工作。