dial jacks

例句：

1. 1. The engineer useda dial jack to lift the heavymachine.
   工程师使用拨号式千斤顶来抬起这台重型机器。
2. 2. Thecarpenter needed adial jack to adjust thedoor hinges.
   木匠需要拨号式千斤顶来调整门铰链。
3. 3.The construction workers used dial jacksto lift the scaffolding.
   建筑工人使用拨号式千斤顶来提升脚手架。