名词
中文翻译：日信号
同义词：
['day mark', 'day signal', 'day indicator']
例句：
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1. The day signal is a device that indicates the start of a new day.
日信号是一种指示新一天开始的设备。
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2. The day signal was used to indicate the end of the workday.
日信号用于指示工作日的结束。
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3. The day signal helped me to wake up on time every morning.
日信号帮助我每天早上准时醒来。