towing a sling

例句：

1. 1.The car was towing heavy loads when it hit the road.
   汽车在上路时拖着沉重的货物。
2. 2. The boat was towing a large net behind it.
   船后面拖着一个大网。
3. 3. The team was towing the ball across the field.
   队伍正在把球从一边拖到另一边。