dragline cableway excavator

例句：

1. 1. The engineersused a dragline to clear the riverbed.
   工程师们使用拖绳来清理河床。
2. 2. The construction crew was using adragline to dig the tunnel.
   施工队正在使用拖绳挖掘隧道。
3. 3. The dragline was essential for the successful completion ofthe project.
   拖绳对于项目的成功完成至关重要。