名词
中文翻译：振铃信号
同义词：
['ringing signal', 'ringing tone']
例句：
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1. The phone rings with aringing tone.
电话响了，是振铃音。
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2. The alarm clock has aringing tone that wakes you up.
闹钟有振铃音，能把你叫醒。
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3. Thepolice received a ringing tonefrom the emergency number.
警方接到了一个紧急号码的振铃音。