The water level is still going up and down.
水位仍在继续上升。
Going up and down stairs will be good exercise for me.
上上下下爬楼梯对我会是的锻炼。
We don't want to find ourselves continually going up and down emotionally.
我们不想让自己的情绪持续上下波动。
The truck started going backward, and building up speed on the way down.
那辆货车开始慢慢地往山下后退，并在溜坡的过程中速度越来越快。
The truck started going backward, and building up speed on the way down.
那辆货车开始慢慢地往山下后退，并在溜坡的过程中速度越来越快。
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