The small intestine has three parts: the duodenum, the jejunum, and the ileum.

分为三个部分，分别为十二指、与回。

The middle section is the jejunum, where most of the absorption takes place.

中间部分是，大部分吸收发生在那里。

The next section is called the jejunum, and it has long projections on its surface, giving it a large surface area for absorption.

的下一节段叫做，它表面有很多长突起，可增大其表面积以利于吸收。

Unlike the jejunum, the ileum is also capable of undergoing structural and functional adaptations to compensate for the jejunum if needed.

与不同，回可进行结构和能上的适应性改变，在必要时代偿能。

As a result, the gallbladder wall can actually adhere to a nearby structure, most commonly at the duodenum, but occasionally to the stomach, colon, and jejunum.

胆囊壁会因而粘附周围脏器，最常见的是十二指，有时也会粘附胃、结和。

This happens in the small intestine's lower regions, the jejunum and ileum, which are coated in millions of tiny projections called villi.

这一过程发生在的下部，即和回， 其内壁覆盖着数百万个微突起， 称为绒毛。

(2) The jejunum, the central section, is the primary absorptive region.

（2）中央部分的，是主要的吸收区域。