有些婴儿无法消化乳糖，因此需要特殊配方奶粉。

Some babies cannot digest ___lactose, so they need special formula milk.

牛奶中的乳糖由葡萄糖和半乳糖组成。

The ___lactose in milk is made up of glucose and galactose.

这种奶粉含有乳糖作为主要成分。

This milk powder contains ___lactose as a main ingredient.