An essential nutrient is something your body must get from food.
必需营养素是指你的身体必须从食物中获取的物质。
Because the body cannot synthesize vitamin C, it is considered an essential nutrient and should be included regularly in a balanced diet.
由于人体无法合成维生素C,它被视为必需营养素,因此应在均衡饮食中经常摄入。