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。
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。
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