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為什麼開著個風扇/抽氣扇,會看見個扇葉像慢慢轉番轉頭?

為什麼開著個風扇/抽氣扇,會看見個扇葉像慢慢轉番轉頭?

為什麼開著個風扇/抽氣扇,會看見個扇葉像慢慢轉番轉頭?

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maybe the frequency of our eye's nerval detection system is higher than that of the fan, it appears the fan turn back.

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請樓主自己做一個實驗, 試下望著風扇每一秒眨一次眼, 然後再試每二秒眨一次眼, 看看有甚麼分別.

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