English-Hanzi/Vitamin is an essential micronutrient

A vitamin is an organic molecule which is an essential micronutrient that an organism needs in small quantities for the proper functioning of its metabolism.

维生素 是 一种 有机分子，是 一种 必需的 微量营养素，有机体 需要 少量 使其 新陈代谢 正常运作.