【英语时差8,16】别担心！你不会秃头的（上）（在线收听）

If you find hairs in the bathtub after a shower or you find hairs stuck in your comb, don’t worry; you’re not necessarily going bald. And yet if you kept track of all the hairs you found over a period of a few years, it would seem that what’s left on top must be getting thinner. In fact, hairs fall out naturally all the time. And, like leaves or pine needles, each hair goes through a cycle of gradually growing out and eventually falling off. A new hair begins near the surface of the skin and starts out like the “peach fuzz” on the upper lip of an adolescent boy. As the hair grows out, it thickens and the follicle grows deeper. In its final stage, the hair coming out of the follicle gets thinner and becomes less firmly attached. At this point, the hair falls out easily.