NTUMC+ Open Multilingual Wordnet 0.9

小声, 低声

undertone

a quiet or hushed tone of voice

低声, 低调, 低声+的

low, low-pitched

used of sounds and voices; low in pitch or frequency

耳语, 低声说, 私语, 低声

whisper, voicelessness, whispering, susurration

speaking softly without vibration of the vocal cords

低声, 低声+地

sotto voce, in a low voice

in an undertone

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