unfamiliar sounds
definitions
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Auditory stimuli or noises that a person has not encountered before or does not recognize.zh: 不熟悉的的声音
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Strange, unexpected, or eerie noises that often evoke a sense of mystery, curiosity, or unease.zh: 怪异的声音
examples
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The baby woke up because of the unfamiliar sounds coming from the hallway.
宝宝因为走廊传来的不熟悉的声音而醒了。
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She lay in bed, listening to the unfamiliar sounds of the great house.
她躺在床上,听着这座大房子里传出的怪异声音。