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1. Oxford Dictionary

   infrasonic

   • IPA[ˌɪnfrəˈsɒnɪk]

   英式

   • adj.
     relating to or denoting sound waves with a frequency below the lower limit of human audibility.
2. • 更多解釋

   infrasonic

   • IPA[ˌinfrəˈsänik]

   美式

   • adj.
     relating to or denoting sound waves with a frequency below the lower limit of human audibility.

   Oxford American Dictionary