anchor bolt and nut

例句：

1. 1. Theship was anchored in the harbor forrepairs.
   这艘船在港口修理时被锚住了。
2. 2. The engineer used a special boltto secure the heavy equipment.
   工程师用一种特殊的螺栓来固定重型设备。
3. 3. Theworkers carefully removed the nutsfrom the bolts before reassembling the machine.
   工人们小心翼翼地从螺栓上卸下螺母，然后重新组装机器。