n. 无声，寂静：没有声音或极少声音的状态。
无声
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The soundlessness impressed her as a positive entity rather than as the mere negation of noise.
万籁俱寂，这给她的印象与其说是声音的虚无，不如说是一种实际的存在。
It was a daytime ghost, its wings beating with a huge soundlessness.
BBC: England��s ghostly South Downs Way