当温度降低时，空气中的水蒸气饱和度降低，湿度减小。

When temperature is lower, water vapour in the air, humidity decrease.

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齿痕舌与瘀点舌的舌色饱和度降低。

The colour saturation degrade in spotted tongue and dark tongue.

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齿痕舌与瘀点舌的舌色饱和度降低。

The colour saturation degrade in spotted tongue and dark tongue.

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