They say it takes some training. And there can be risks, like running when your feet are too cold to feel if you get injured.

VOA: special.2010.02.03

From this point of view then, the reason why you sneeze when you have a cold is that your cold the cold virus is using your body as a tool to replicate itself.

从这个角度看，感冒时打喷嚏是因为,感冒病毒用你的身体繁衍后代。

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