在幼儿园,常看到有的幼儿没事干就挖鼻孔,这是一个既危害健康又不文明的不良习惯。我们知道,鼻孔里长有许多绒毛,它的作用是阻止外界细菌、灰尘等脏东西随着人的呼吸进入鼻腔,起到门卫的作用。当灰尘、细菌吸进鼻孔时,鼻孔里 In kindergarten, often see some children have nothing to do to dig nostrils, this is a not only harmful to health and uncivilized bad habits. We know that there are many fluffs in the nostrils, and its role is to prevent outside bacteria, dust and other dirt from entering the nasal cavity as the human breath plays the role of gatekeeper. When the dust, bacteria inhaled into the nostril, the nostrils