A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.
A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.
微量养料；微量营养元素一种对生物的正常生长和新陈代谢极其重要的微量物质，如一种维生素或矿物质