light tug

例句：

1. 1.The boat drifted gently in the calm water.
   小船在平静的水面上轻轻漂移。
2. 2.He pulled the rope to get the car moving.
   他拉绳子让汽车动起来。
3. 3.The dog dragged its tail behind it as it ran away.
   狗拖着尾巴跑开。