blocking nut

例句：

1. 1. The car's engine is blocked and needs to be taken to a mechanic for fixing.
   汽车发动机被堵塞了，需要送到修车厂修理。
2. 2.The construction workers used blocking nuts to secure the wooden beams in place.
   建筑工人使用阻塞螺母来固定木梁的位置。
3. 3.The engineer replaced the faulty block with a new one, which resolved the problem of the blocked valve.
   工程师用一个新的替换了故障的阀块，解决了阀门堵塞的问题。