“螺母”造句

拧下车轮螺母，放掉车胎的气，换上备用胎。
Remove wheelnuts, let down tyre, put on spare.

先松开螺母，然后卸下车轮。
First loosen the nuts, then take off the wheel.

这个旧螺母咬不住扣儿.
This old nut won't bite [ grip ] .