tight nut

例句：

1. 1. The car was so tight that it wouldn't fit through the door.
   这辆车太紧了，无法通过门。
2. 2. He tightened the screws on the hinges to make sure they were secure.
   他拧紧铰链上的螺丝，确保它们牢固。
3. 3. The engineer used a special tool to tighten the nuts on the bolts.
   工程师使用特殊的工具来拧紧螺栓上的螺母。