头发为什么变白?

• 作者: 陈诗怡
• 来源期刊: 英语画刊（高级版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: 科学小知识
• 页码范围: 20
• 页数: 1页
• 语种: 中文

摘要

Each strand of hair is made by a part of the skin called a hair follicl. The color of the hair comes from a chemical called melanin. The follicle adds melanin as it makes the hair. For many of us, the hair follicles stop making melanin as we age. Hair looks white or gray because of the lack of added color. 参考译文: 每一缕头发是由一部分叫做毛囊的皮肤生成的.而头发的颜色来自于一种名叫黑色素的化学物质.毛囊生成头发时加入了黑色素.对我们许多人来说,随着年龄的增长,毛囊便不再产生黑色素.少了增加的黑色素,头发看起来就是白色或灰色的了.