名词
中文翻译：角质
同义词：
['keratosine', 'keratinous', 'keratinous acid']
例句：
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1. The hairon his head is made up of keratin.
他头上的头发由角质组成。
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2.The skin on the back of his hand is rich in keratin.
他的手背上的皮肤富含角质。
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3. Keratin plays a crucial role in maintaining the structure and elasticity of hair and nails.
角质在保持头发和指甲的结构及弹性方面起着至关重要的作用。