| 单词 | infrasound |
| 释义 | infrasound in.fra.sound AHD: [¹n“fr…-sound”] D.J. [6!nfr*7sa&nd]K.K. [6!nfr*7sa&nd]n.（名词）A wave phenomenon sharing the physical nature of sound but with a range of frequencies below that of human hearing.次声：一种波现象，它有声音的物理特性和频率又在人耳的听力范围之内 |
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