Blowing your nose to alleviate stuffiness may be second nature, but some people argue it does no good, reversing the flow of mucus into the sinuses and slowing the drainage.

由于第二天性使然，人们会通过擤鼻涕来缓解鼻塞，但有人认为这样做没啥好处，还会使鼻涕逆流入鼻窦，引发呼吸不畅。

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They figured out the flu kept its virulent characteristics best in human mucus, which Dr. Marr took from the dripping nose of her 1-month-old baby.

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Each is lined with tissue called the mucosa, which secretes mucus continuously along hairy cells called cilia and out a tiny passageway called an ostium, through which the mucus drains into the nasal cavity and down the back of the throat, where it is swallowed (unless you blow your nose).

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