unthreading end

例句：

1. 1. The screwdriver is designed to unthread the bolts easily.
   螺丝刀设计用来轻松地拧松螺栓。
2. 2.The unscrewing process requires careful attention to avoid damaging the workpiece.
   拆卸过程需要小心谨慎，以免损坏工件。
3. 3. The engineer used a special tool to unthread the old pipe and replace it with a new one.
   工程师使用特殊工具将旧管道拆下并用新的替换。