短语
中文翻译：上下
同义词：
['around', 'around the clock', 'back and forth', 'up and down']
例句：
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1. The team practiced up and down the field for an hour.
队伍在场上来回练习了一个小时。
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2. She was up and down in her room, trying to decide what to wear.
她在房间里来回走动，试图决定穿什么。
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3. The kids were up and down the stairs, playing hide-and-seek.
孩子们在楼梯上跑来跑去，玩捉迷藏游戏。