But to help absorb sugars, there are special enzymes, on the top surface or brush border of the intestinal cells, called brush border enzymes.

但糖类的吸收需要一类特殊的酶来协助；这类酶分布于小肠细胞的顶端，即小肠粘膜刷状缘；这类酶也因此称为刷状缘酶。

Enzymes are proteins, and proteins are expensive. So these compounds — known as brush border enzymes — can just sit around and process food as it passes by, without your body having to make new ones.

酶是蛋白质，蛋白质很昂贵。所以这些化合物——被称为刷状边界酶——可以在食物经过时无所事事地处理食物，而你的身体不必制造新的。