dog whistle is in ultrasonic range, human can't detect it.

來源: 移花接木於 2025-01-05 16:42:24 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (0 bytes)

回答: thx 4 pointing it out. I missed that due 2 hearing issue;-)) 由最西邊的島上於 2025-01-05 14:33:57

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