Lactose intolerance stems from a deficiency of the enzyme lactase, which is needed to help digest lactose, a sugar in milk.

乳糖不耐症的病因是缺乏乳糖酶，这些乳糖酶是消化乳糖的必需物质，牛奶中的糖就属于此类。

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These allergies shouldn't be confused with lactose intolerance, which is when the body doesn't produce enough of the enzyme lactase to break down lactose, a sugar in cow's milk.

这些过敏症不应和乳糖不耐症混淆，乳糖不耐症指的是身体不能制造足够的乳糖酶来分解乳糖，这正是牛奶中所含的一种糖分。

youdao

These allergies shouldn't be confused with lactose intolerance, which is when the body doesn't produce enough of the enzyme lactase to break down lactose, a sugar in cow's milk.

这些过敏症不应和乳糖不耐症混淆，乳糖不耐症指的是身体不能制造足够的乳糖酶来分解乳糖，这正是牛奶中所含的一种糖分。

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