角质是一种硬纤维蛋白，在头发和指甲中都存在。
Keratin is a tough, fibrous protein found in hair and nails.
像犀牛角，其主要成分是角质，与人的毛发和指甲一样富含纤维蛋白质。不过，有些地区的人还认为犀牛角可以壮阳。
Rhino horns, for example, are mostly made of keratin, the same fibrous protein found in human hair and fingernails, but people in some cultures still think of them as an aphrodisiac.
当头发角质层开始破坏，内部纤维暴露的时候，头发就会变得干燥。
When the hair periostracum starts breakage, internal at the time that fiber exposed, the hair would become dry.
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