副词
中文翻译：当
同义词：
['meanwhile', 'meanwhile', 'at the same time']
例句：
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1. While I was waiting for the bus, I saw a dog on the street.
我在等公交车的时候，看到一只狗在街上。
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2. While he was sleeping, his phone rang.
他睡觉的时候，手机响了。
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3. While they were discussing the project, they realized their mistake.
他们讨论项目的时候，意识到了他们的错误。