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单词 θ76762
释义
the world > matter > physics > science of sound > vibration > [noun] > above human range (4)
ultrasound1923

Sound waves or vibrations with frequencies greater than those audible to the human ear, or greater than 20,000 Hz; also, ultrasonic techniques.

ultrasonics1924

With plural agreement. Ultrasonic waves; ultrasound.

Subcategories:

— science of (2)
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更新时间:2024/12/23 19:30:14