Organism immunity level will reduce.

机体的免疫水平会降低。

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Since then, mirth has been shown to reduce stress and even boost immunity.

从那以后，人们注意到欢笑能减少压力，甚至能增强免疫力。

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Since then, mirth has been shown to reduce stress and even boost immunity.

从那以后，人们注意到欢笑能减少压力，甚至能增强免疫力。

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