bowel

Compared meaning: the intestines, part of the digestive system (noun).

比较义项：肠道／消化道器官（名词）。

• gut

  Informal, everyday word for the stomach and intestines as a whole; used casually when talking about digestion, discomfort, or appetite, not in clinical writing.

  非正式、日常用词，笼统地指人的胃和肠（整个消化道）；常用于口语中谈论消化、不适或食欲，不用于医学正式书写。

  Spicy food doesn't sit well in my gut.

  辛辣食物让我的肠胃很不舒服。

• bowel 本词

  A more formal, often clinical term, usually referring to the intestines' function of processing and eliminating waste; common in medical contexts and phrases like 'bowel movement'.

  较为正式、常见于医学语境的词，通常指肠道处理和排出废物的功能；常见于bowel movement（排便）等说法中。

  The doctor asked whether she'd had any bowel problems lately.

  医生询问她最近是否有肠道方面的问题。

• intestine

  The neutral, standard anatomical term for the actual tube; used in biology and medicine to describe its structure and function, without gut's informality or bowel's focus on waste.

  中性的标准解剖学术语，指肠道这一器官本身；常用于生物学和医学中描述其结构和功能，不像gut那样口语化，也不像bowel那样侧重排泄功能。

  The small intestine absorbs most of the nutrients from food we eat.

  小肠吸收我们所吃食物中的大部分营养。

Gut, bowel, and intestine can all mean the intestines, but formality differs. Gut is informal, everyday, used casually for digestion or appetite. Bowel is more formal, often clinical, about waste elimination, as in 'bowel movement'. Intestine is the neutral, standard anatomical term for the tube.

这三个词在表示“肠”这一意义上很接近，容易被中国学习者混淆，但正式程度和使用场合不同：intestine是中性的解剖学术语，bowel多用于医学、临床语境（尤其和排便有关），gut是非正式口语用词，常泛指整个消化道。这里不比较gut表示“直觉”的意义。