为什么人们的肤色各不相同——第1级

29-07-2026 07:00

人们肤色各异,这与阳光有关。在阳光非常强烈的地方,深色皮肤能保护人们免受强光伤害。但当人们迁居到日照较少的地区时,深色皮肤反而会成为问题。

人体需要阳光来合成维生素D。维生素D能让我们拥有强健的骨骼和良好的健康状况。因此,在日照较少的地区,人的皮肤会变得较浅。有些人的皮肤在夏天会变深,冬天则会变浅。

如今,人们四处旅行、定居各地。有时我们需要使用防晒霜来保护皮肤;有时则需要额外补充维生素以保持健康。

您可以在“第3级”栏目中观看原版视频。

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为什么当人们搬到日照较少的地区时,深色皮肤会成为问题?

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