Laughter improves our health against illness by about 40%是 什么意思???

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Laughter improves our health against illness by about 40%是 什么意思???
Laughter improves our health against illness by about 40%
是 什么意思???

Laughter improves our health against illness by about 40%是 什么意思???
笑有助于身体健康抵御40%的疾病.