ultrasonic
plural of binger
(rare, dialect) Smiling; inclined to smile.
present participle of saw gourds
(acoustics) Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.
超音波マイクが人間の可聴域を超えるコウモリの速い鳴き声を記録した。
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