loose bolt

例句：

1. 1. The car's engine was so loud that I could hear the loose bolts rattling inside.
   汽车发动机的声音太响了，我甚至能听到里面的松动螺栓在响。
2. 2.He tightened the loose bolts on the door to make sure it would stay shut.
   他拧紧了门上的松动螺栓，确保门能关紧。
3. 3.The mechanic replaced the loose bolts in the dashboard to fix the problem.
   机械师更换了仪表盘上松动的螺栓来解决问题。