科研之友
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摘要
<正>Well,it happens when something irritates1 our nose.Anyways,it’s basically our bodies’ way of getting rid of invaders.The result is that air along with droplets2 of water and mucus3 get forcefully puffed4 out of our mouth and nose.And,hundreds of thousands of microbes5 might be hitching6 a ride on that snot7 train.
