小肠在英语中叫做 small intestine。它的来源可能源自古希腊语，小肠的古希腊语名称是 "enteron"，意思是"内脏"。

下面是一些英文例句和它们的中文翻译：

The small intestine is a long, narrow tube-like organ in the digestive system.

小肠是消化系统中一个长而窄的管状器官。

The small intestine is responsible for absorbing most of the nutrients from the food we eat.

小肠负责吸收我们食用的大部分营养物质。

The small intestine is divided into three parts: the duodenum, jejunum, and ileum.

小肠被划分为三部分：十二指肠、空肠和回肠。