帮我区分下nutrition和nutrional和nutrient单词的意思

第一.
nutrition 名词
/ njuːˈtrɪʃn; US nuː-; nuˋtrɪʃən/ n [U]
(process of giving and receiving) nourishment; food 营养; 滋养; 食物: adequate nutrition of the body 身体需要的充足的营养 * This food provides all the nutrition your dog needs. 本食品含有狗所必需的一切营养.
the study of human diet 营养学: a number of books on nutrition 若干本营养学的书.

第二.
nutritional / -ʃənl; -ʃənəl/ 形容词
adj: the nutritional value of a food 某种食物的营养价值.

第三.nutrient 可以是名词,也可以是形容词
/ ˈnjuːtrɪənt; US ˈnuː-; ˋnutrɪənt/ n, adj (fml 文) (substance) serving as or providing nourishment, esp for plants or animals 营养的, 滋养的（物质）: Plants draw minerals and other nutrients from the soil. 植物从泥土中吸收矿物质和其他养料.

都来自牛津高阶

nutrition
n [U]
(process of giving and receiving) nourishment; food 营养; 滋养; 食物: adequate nutrition of the body 身体需要的充足的营养 * This food provides all the nutr