tight manhole cover

例句：

1. 1. The worker tightenedthe manhole cover before he started todig.
   工人在开始挖掘之前，先紧固了井盖。
2. 2. Theold house had a tightmanhole cover that was difficultto open.
   这所旧房子有一个很难打开的紧固井盖。
3. 3. Theengineer carefully removed the tight manhole coverto inspect the pipes.
   工程师小心翼翼地移除了紧固的井盖来检查管道。