Besides egg whites, drugs made of proteins come in the milk of cows and sheep.
除了蛋白以外,蛋白质制成的药物还来自牛奶和羊奶。
What you're supposed to know: Milk (cow, goat, sheep, human . . .) contains a sugar called lactose, which is normally broken down by the enzyme lactase.
必备知识: 奶类(包括牛奶、山羊奶、绵羊奶及母乳等)含有一种叫作乳糖的糖类,它通常由乳糖酶分解。
Milk can be made into cheese. Some people like cheese made with milk from a sheep.
好,下个问题:牛奶可以制成奶酪,有的人喜欢羊奶做的奶酪。
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