This is what said about lactase from wiki

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送交者: yuffie 于 2008-10-27, 21:12:58:

回答: 我现在什么都不管，只要是好喝， 由 shine 于 2008-10-27, 21:01:49:

Lactase is also used in the manufacture of ice cream. Because glucose and galactose are sweeter than lactose, lactase produces a more pleasant taste.

Maybe that is the reason even in milk.



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