鼻涕多到鼻腔都满溢,所以倒流去喉咙.低浓度缓冲液盐水能稀释鼻粘液，

使鼻涕变得容易擤出来.

http://www.xinhuanet.com/local/2021-01/05/c_1126945758.htm

https://www.haodf.com/neirong/wenzhang/9029983007.html