讓鼻涕留在鼻孔有什麼後果?鼻涕與鼻屎有何

well, before answering the question, you need to know what role does the noise play . there are three main functions: firstly it identify the smell of objects, secondly, it regulate the moisture of the air intake, making sure the air inhale is wet and will not cause damage, thirdly, it filter out the air so that the inhale air is relative dust free.

As you can see, if you let the excretion 鼻涕 stay in noise, it will create a perfect environment for bacteria to grow, or in may increase you chance for upper respiratry track infection.

鼻屎 is probably the dry up version of the excretion(鼻涕).

I hope this is the right answer...