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。

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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。

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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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