The colder the air, the less moisture it contains, which can mean dry eyes, causing the cells that produce tears to shut down to protect themselves from the irritation.
空气越冷就越干燥，这就会导致眼睛干涩，分泌泪水的细胞为了免受刺激会暂停运作。
The spots arise when groups of cells begin producing pigment in response to repeated stress or irritation of the skin.
这些黑斑在大量细胞由于反复压力或皮肤受到刺激产生色素时出现。
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