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How big is 人类头髮宽度?

100 micromètres!

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人类头髮宽度

人的头髮很神奇喔. 直头髮几乎是完美的圆柱体, 不过呢, 捲头髮却是扁扁的, 所以它会捲 曲, 就像缎带一样. 你知道你头上可能有 5 万到 20 万根头髮吗? 可以算算看喔!

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L'échelle de l'Univers > 人类头髮宽度

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