短语
中文翻译：在工作状态中
同义词：
['on duty', 'on standby']
例句：
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1. The policeman was on the rolls when the fire broke out.
消防队出动时，警察正在待命。
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2. She was on the rolls for the next few hours.
她在接下来的几个小时里都在待命状态。
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3. The team is on the rolls, ready to go at a moment's notice.
队伍随时待命，一有需要就能出发。