time signal
noun [ C usually singular ] uk/ˈtaɪm ˌsɪɡ.nəl/ us/ˈtaɪm ˌsɪɡ.nəl/
（收音机发出的）报时信号
a signal that is broadcast on the radio at an exact time, for example one o'clock, to show accurately what the time is
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