double nut

例句：

1. 1. The car was fixed with a double nut to hold the wheel in place.
   这辆车用一个双头螺栓固定车轮。
2. 2. He used a double nut to secure the door shut.
   他用一个双头螺栓把门关紧了。
3. 3. The engineer double-checked all the parts before installing the double nut.
   工程师在安装双头螺栓之前，仔细检查了所有部件。