常見(jiàn)例句用作名詞 (n.)Freckles are caused by the sediment of melanin.色斑的形成是因爲(wèi)黑色素沉積。Melanin darkens the skin and is the cause of suntan.黑色素使皮膚變黑是人被曬黑的原因。 返回 melanin