Hair's natural shine is supplied by its own conditioner, sebum, an oil composed of waxes and fats and also containing a natural antiseptic that helps fight infection. Too much sebum results in greasy hair and conversely, too little sebum makes dry hair.
分词翻译
干的英语翻译：
do; work; able; dry; empty; for nothing; main part; trunk; offend; strike 【医】 caudex; scapus; shaft; stem; truncus; trunk
音的英语翻译：
aspirate; news; sound; tone 【医】 bruit; note; phon-; phono-; sonus; sound; tone
