RE: RE: 갇혀있는 생명
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RE: 갇혀있는 생명

dogfact(64)
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Did you hear that? Sound frequency is measured in Hertz (Hz). The higher the Hertz, the higher-pitched the sound. Dogs hear best at 8,000 Hz, while humans hear best at around 2,000 Hz.

@dogfact: Did you hear | Ecency