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The harm of swallowing phlegm can be worse than you think!

The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!
The harm of swallowing phlegm can be worse than you think!

The reproduced content represents the views of the author only

Does not represent the position of the Institute of Physics, Chinese Academy of Sciences

Original title: How dangerous is it to swallow phlegm?

Source: Dr. Curious

EDIT: just_iu

Institute of Physics, Chinese Academy of Sciences
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