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並前往https://www.hearingtracker.com/ask/humans-can-hear-frequencies-up-to-20-khz-why-don-t-hearing-aids-provide-sound-at-frequencies-above-10-khz

Humans can hear frequencies up to 20 kHz. Why don't ...

Testing extended high frequencies is also very problematic from a reliability standpoint. The physics of sound frequencies above 14-15k become ...

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