The researchers said this could explain why stress can also cause pigmentation which makes the skin appear darker.

研究人员说，这可能会解释为什么压力也会导致色素沉着使皮肤显得更黑。

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This could explain why other planets don't have rings like Saturn's.

这可以解释为什么其他星球没有像土星那样的光环。

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This could explain why Britain, a nation passionate about tea-drinking but where almost everybody adds milk to their cup, fails to make headway against cardiovascular disease.

这就是英国——这个热爱饮茶，却几乎人人都往茶中加牛奶的国度——在对抗心血管疾病方面并无进展的原因。

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This could explain why Britain, a nation passionate about tea-drinking but where almost everybody adds milk to their cup, fails to make headway against cardiovascular disease.

这就是英国——这个热爱饮茶，却几乎人人都往茶中加牛奶的国度——在对抗心血管疾病方面并无进展的原因。

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