Cells of the germinal matrix under go a process called keratinization, which is the formation of a layer of the protein keratin, keeping the hair from falling out.是什么意思_Cells of the germinal matrix under go a process called keratinization, which is the formation of a layer of the protein keratin, keeping the hair from falling out.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句