vitamin

/ˈvaɪtəmən/

any of a group of organic substances essential in small quantities to normal metabolism

中文释义：维生素

Citrus fruits are rich in vitamin C, which boosts the immune system.

柑橘类水果富含维生素C，能增强免疫系统。

A deficiency of vitamin D can lead to bone problems in adults.

缺乏维生素D可能导致成年人骨骼问题。