back nut

例句：

1. 1. The car needs a new back nut to fix the brakes.
   这辆车需要换一个新的后轮螺母来修理刹车。
2. 2. He tightened the nuts on the door hinges with a wrench.
   他用扳手紧固了门铰链上的螺丝。
3. 3.The engineer replaced the worn back nut with a new one.
   工程师用一个新的替换了磨损的后轮螺母。