bob up like a cork

例句：

1. 1.The ball bounced off the wall and rolled to the other side.
   球从墙上弹起，滚到了另一边。
2. 2.When she jumped, her feet bobbed up like corks.
   当她跳跃时，她的脚像软木塞一样弹了起来。
3. 3.The children were playing with their toys, and their playful movements made them bob up and down.
   孩子们在玩他们的玩具，他们活泼的动作使他们弹来弹去。