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， 你就得到了二，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而成。

So simple sugars, whether they're natural or added, are mixtures of monosaccharides or disaccharides.

述的简单，管是天然还是添加，都是单与双的混物。

Mono- and disaccharides come from fruits, honey, sugar beets and sugar cane, while polysaccharide starches come from veggies and grains.

单和双来自水果、蜂蜜、甜菜和甘蔗，而多淀粉来自蔬菜和谷物。

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.

当你吃东西时，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。

It's known as milk sugar because it's only found in nature when it links with glucose to form lactose, a disaccharide found in the milk of mammals, which includes cow and human breast milk.

这是因为半乳在自然中以与葡萄的形式存在，它们形成一种双，即乳；牛乳、母乳等哺乳动物的乳汁都含有乳。