有同学无聊时喜欢用火柴棍和其他一些物品掏耳屎,其实耳屎是有用的,不能随便掏。耳屎的主要成分有油脂、脂肪酸、蛋白质和黄色素等。因为其含有油脂,所以能起到滋润耳道上的细毛的作用。这些细毛能阻挡外界吹进来的尘埃颗粒,耳屎和细毛还能防止昆虫等对耳朵的侵害,偶然闯入的小虫碰到密茸茸的细毛会被挡住去路。耳屎的味道也不怎么样,当小虫尝到苦味后也会知难而退。 When a classmate is bored, he likes to use a matchstick and some other things to whisper. Actually, deafness is useful, and he cannot just lick. The main components of deafness are oils, fatty acids, proteins and yellow pigments. Because it contains oil, it can play a role in moisturizing the ear canal. These fine hairs can block dust particles coming from the outside. Deafness and fine hair can also prevent insects from damaging the ears. Occasionally, the infested bugs can get caught in the fine hairs. The smell of deafness is not very good, and when the bugs taste bitterness, they will retreat.