Link two of them together, and you've got a disaccharide, lactose, maltose, or sucrose.

把这些中的其中两种连接起来， 你就得，乳，麦芽或者蔗。

Sucrose, or table sugar, is another disaccharide and it’s formed when fructose links up with glucose.

蔗是另一种双，又称白砂，它是由一分子果和一分子葡萄结合而成。

Now when you eat something like a piece of onion bread, enzymes start breaking down disaccharides, oligosaccharides, and polysaccharides into monosaccharides so they can be absorbed.

当你吃西，比方说一片洋葱面包，消化酶便开始将食物中的双、寡、多分解为单，以便人体吸收。

Maltose is another disaccharide and this one is two glucose molecules linked together, and it’s found in molasses which can be used as a substrate to ferment beer.

麦芽也是一种双，由两分子葡萄组成，多存在于浆中，可以用作啤酒发酵的底物。