It boosts your immune system: Smiling really can improve your physical health, too.
笑可以增强免疫系统：笑还能够改善身体健康。
Often use can improve the nervous system, digestive system, immune system and circulatory system function.
常常运用可以改善神经系统、消化系统、免疫系统和轮回系统功用。
In order to prevent the disease, what should we do to improve their immune system?
为了防止疾病发生，我们应该怎样提高自身免疫力呢？
In order to prevent the disease, what should we do to improve their immune system?
为了防止疾病发生，我们应该怎样提高自身免疫力呢？
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