towing line

例句：

1. 1. The tractor pulled the trailer behind it.
   拖拉机拉着拖车。
2. 2.The towing line was securely fastened to the car's frame.
   牵引线牢固地固定在汽车框架上。
3. 3. The towing line was used to pull the heavy truck out of the ditch.
   牵引线用来将重卡车从沟里拉出来。