对开螺母

例句：

1. 1. We need to tighten the screws on the door to make sure it stays closed.
   我们需要拧紧门上的螺丝，确保它保持关闭。
2. 2. The carpenter used a wrench to remove the hexagonal nuts from the bolts.
   木匠用扳手从螺栓上拆下了六角螺母。
3. 3. He carefully replaced the damaged nuts with new ones, ensuring the assembly was secure.
   他小心翼翼地用新的螺母替换了损坏的螺母，确保组装牢固。