其实人类的鼻腔里时刻都有鼻涕,也离不开鼻涕,它是保护身体的一道屏障。鼻涕能防止鼻腔黏膜干燥,湿润吸进的空气,粘住由空气中吸入的灰尘、花粉、微生物,以免它们刺激呼吸道或引起感染。 In fact, the human nose at all times have a nose, but also inseparable from the nose, it is a barrier to protect the body. Nose can prevent the nasal mucosa dry, moist inhaled air, stick to the dust inhaled by the air, pollen, microorganisms, so as to prevent them to stimulate the respiratory tract or cause infection.