tightening nut

例句：

1. 1.I need to tighten the nuts on this bolt before it falls apart.
   我需要在这个螺栓上拧紧螺母，否则它会散架。
2. 2.The mechanic tightened the nuts on the wheel hubs to make sure they were securely attached.
   机械师把轮轴上的螺母拧紧，确保它们牢固地连接在一起。
3. 3. Before we start work, we need to tighten all the nuts on the gears to ensure smooth operation.
   在我们开始工作之前，我们需要把所有齿轮上的螺母拧紧，以确保顺利运行。