audio frequencies above the upper limit of human hearing (approx 20,000 khz)

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الإنجليزية - الإنجليزية
ultrasonic
audio frequencies above the upper limit of human hearing (approx 20,000 khz)

    الواصلة

    au·di·o frequencies a·bove the up·per lim·it of hu·man hear·ing (approx 20,000 khz)
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