动词短语
中文翻译：上下查看
同义词：
['scan', 'scrutinize', 'examine例句：1. The detective looked up and down the street before he called for backup.（侦探在街对面来回查看后呼叫支援。）']
例句：
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1. The detective looked up and down the street before he called for backup.
侦探在街对面来回查看后呼叫支援。
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2.After the fire, we had to look up and down the building to make sure nothing was left behind.
火灾后，我们必须检查整栋楼以确保没有遗留任何东西。
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3. She looked up and down the aisles of the store, looking for a specific item.
她在商店的过道里四处寻找特定的商品。