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单词
infrasound
释义
in·fra·sound
\ˈinfrəˌˌ\
noun
Etymology:
infra- + sound (III)
:
a wave phenomenon of the same physical nature as sound but with frequencies below the range of human hearing
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keel-shaped scraper
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keelung
keemun
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更新时间:2025/12/21 9:15:39