1
the rectum + be + noun phrase
指具体器官时通常加定冠词 the。
The rectum is the terminal part of the large intestine.
直肠是大肠的末端部分。
直肠
先理解核心含义，再看它在真实句子里的用法。
直肠
the terminal section of the large intestine, leading to the anus
The rectum is the terminal part of the large intestine.
直肠是大肠的末端部分。
直肠:大肠的末端部分,粪便离开结肠后经此排出体外(通过肛门或泄殖腔)。
The terminal part of the large intestine through which feces pass after exiting the colon, but before leaving the body through the anus or cloaca.
The rectum is the last part of the large intestine.
直肠是大肠的最后一部分。
The doctor used a small camera to look at the patient's rectum during the exam.
医生在检查时用小摄像头查看病人的直肠。
The doctor asked me if I had any pain in the rectum.
医生问我直肠是否疼痛。
指具体器官时通常加定冠词 the。
The rectum is the terminal part of the large intestine.
直肠是大肠的末端部分。
into 强调插入的方向，表示位置时用 in the rectum。
The doctor inserted a small tube into the rectum.
医生将一根细管插入直肠。
through 表示药物等经过的路径。
This medicine is absorbed through the rectum.
这种药物通过直肠吸收。
Not this
The doctor examined both rectum.
Use this
The doctor examined both rectums.
rectum 是可数名词，both 后面必须用复数 rectums；汉语名词没有复数变化，所以容易漏掉 -s。加 s 后与 both 一致。
Not this
He had surgery on rectum.
Use this
He had surgery on his rectum.
英语中谈及身体部位时，通常要用物主代词或冠词来限定可数名词 rectum；汉语常说“在直肠上”而不带限定词，所以容易遗漏。加上 his 后句子才符合英语语法。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
直肠癌
The biopsy confirmed cancer of the rectum.
活检证实了直肠癌。
直肠出血
Bright red blood may indicate bleeding from the rectum.
鲜红色血液可能表明直肠出血。
直肠脱垂
Elderly patients may develop a prolapse of the rectum.
老年患者可能发生直肠脱垂。
直肠炎
Inflammation of the rectum can be caused by an infection.
感染可导致直肠炎。
直肠检查
The doctor performed an examination of the rectum.
医生进行了直肠检查。
直肠？差点要了他们的命！
The classic joke's punchline, "Rectum? Damn near killed 'em!" still gets laughs today.
这个经典笑话的笑点“直肠？差点要了他们的命！”至今仍逗人发笑。
Use rectum naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
rectum 以 rect- 开头，和 rectangle（矩形）一样带‘直’的感觉；直肠就是肠道中较直的那一段。
语域：formal 常见场景：medical examination、anatomy class、clinical documentation 该词为解剖学正式术语，通常多用于医学文献、临床报告或专业教学等正式语境；日常非正式交流中较少直接使用。
正式或医学术语中也用拉丁复数 recta。
Dictionary facts from ECDICT, WIKTIONARY.