套筒

例句：

1. 1. The screws on the door are loose.
   门上的螺丝松了。
2. 2. She used a screwdriver to tighten the screws.
   她用螺丝刀拧紧了螺丝。
3. 3.The car was fixed by the mechanic with new screws.
   汽车被机械师用新的螺丝修好了。