If I see a bunch of sick people, maybe a big infection is around, and I better kick my immune system into high gear.
如果我看到一群病患，这里有可能有传染病，那么我最好把自己的免疫系统再开高一个档。
The healthier you are, the better your immune system will protect you against the virus.
你越健康，你的免疫系统就能更好地抵御病毒的侵袭。
Smiling helps the immune system to work better.
微笑可以让免疫系统更好的工作。
Smiling helps the immune system to work better.
微笑可以让免疫系统更好的工作。
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