螺丝钉

例句：

1. 1. The car needs a new screw to fix the door.
   这辆车需要一个新的螺丝来修理车门。
2. 2. He used a screwdriver to tighten the screws on his desk.
   他用螺丝刀把书桌上的螺丝拧紧了。
3. 3. The screws holding the shelf together are rusted and need to be replaced.
   支撑架子的螺丝生锈了，需要更换。