The car was bouncing up and down as if someone were jumping on it.
车上下颠簸，仿佛有人正在上面跳动。
Children like bouncing up and down on a sofa.
孩子们喜欢在沙发上蹦蹦跳跳。
You can't really read on a treadmill because you are bouncing up and down.
你不能真正在跑步机上阅读，因为你是反弹向上和向下。
The basketball is dribbled up the court by bouncing it up and down.
篮球滴下法院通过上上下下弹起它。
The basketball is dribbled up the court by bouncing it up and down.
篮球滴下法院通过上上下下弹起它。
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