A whitish liquid containing proteins, fats, lactose, and various vitamins and minerals that is produced by the mammary glands of all mature female mammals after they have given birth and serves as nourishment for their young.

• 奶，乳一种白色液体，含有蛋白质、脂肪、乳糖和多种维生素和矿物质，所有成年雌性哺乳动物在生产后其乳腺会分泌出该液体，用来哺育其幼儿