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。
Lactose intolerance is the inability to digest lactose, the sugar found in milk.
乳糖不耐症是指乳糖吸收功能障碍，这些乳糖存在于牛奶中。
For example, in individuals with lactose intolerance, the body is unable to break down lactose, a sugar found in milk.
举例来说，对乳糖——牛奶中所含的一种糖——不耐受的人，身体不能就不能分解乳糖。
应用推荐