spring lug

例句：

1. 1. The car's spring lug is worn out, so it won't stay in place anymore.
   车的弹簧扣磨损了，所以现在它不再能固定住。
2. 2. The door was held closed by the spring lug until the lock broke.
   门是由弹簧扣保持关闭的，直到锁坏了。
3. 3. The old bicycle has a rusty spring lug that needs to be replaced.
   旧自行车有一个生锈的弹簧扣，需要更换。