As varied as the animal kingdom's anuses are, none of them have bones.

管动物王国的肛门种类繁多，但没有一个肛门是有骨头的。

You're not giving me a rectal. Do not ask me to cough.

不许给我做肛门指诊。不要让我咳嗽。

He'd enjoy them when they came out.

他很喜欢把他们从肛门里排出来的感觉。

But nature's full of exceptions, and strangely, some animals have lost their anuses.

但是自然界充满了例外，奇怪的是，有些动物失去了肛门。

These parasympathetic neurons make the rectum contract and the internal anal sphincter relax.

这些副交感神经元可以使直肠收缩，并使肛门内括约肌松弛。

Brittle stars and many parasites had ancestors with anuses, but no longer have them.

蛇尾和许多寄虫的祖先有肛门，但现在已经没有了。

During life's three billion-plus year journey on Earth, anal evolution happened independently many times in different branches of life.

在命在地球上 30 亿多年的旅程中，肛门进化在不同的命分支中独立发了许多次。

16 and 18 have been associated with cervical cancers and other types of cancers, including anal cancer and penile cancer.

HPV 16 型和 18 型与宫颈癌及其他癌症（如肛门癌和阴茎癌）相关。

Instead, from the gut, bacteria get to the rectum, anus and eventually colonizes the perineum, becoming part of the normal flora.

相反，细菌由肠道到达直肠、肛门，最终定居于会阴，成为正常菌群的一部分。

Hemorrhoids are swollen veins near the anus and rectum, which can be painful and lead to itching and bleeding.

痔疮是肛门和直肠附近的肿胀静脉，会引起疼痛并导致瘙痒和出血。

Specialized tube feet can be used for feeding and respiration, though many sea cucumbers actually breathe through their anuses.

专门的管脚可用于进食和呼吸，管许多参实际上是通过肛门呼吸的。

A sea cucumber is essentially a brainless, fleshy form surrounding a digestive tract, bookended by a mouth and an anus.

参本质上是一种无脑的肉质形式， 围绕着消化道，由嘴巴和肛门构成。

Treatment is typically surgical resection of the area that's lacking the nerve fibers, and then the healthy end is connected to the anus.

治疗疾病一般行根治手术，切除神经纤维缺失的肠段，然后将剩余肠段健康的一端连肛门。

He put one of his feet on the fish and slit him quickly from the vent up to the tip of his lower jaw.

他用一只脚踩在鱼身上，从肛门朝上，倏的一刀直剖到它下颌的尖端。

Ain't one of them been born whose asshole wouldn't pucker up tighter than a snare drum when you ask for funds.

当你要钱的时候，没有一个不会把他们肛门缩得像小军鼓那么紧的。

Extending from the end of the ileum to the anus, it is divided into four parts: cecum, colon, sigmoid colon and rectum.

大肠从回肠末端延伸到肛门，并分为四个部分：盲肠，结肠，乙状结肠和直肠。

The most widely-used definition of deuterostome has to do with how our mouths and — the SciShow comments’ favorite term — anuses develop.

最广泛使用的后口动物定义与我们的嘴巴和——SciShow 评论最喜欢的术语——肛门的发育方式有关。

Symptoms of cauda equina include decreased bowel and bladder control due to a decreased tone of anal sphincters and muscle wall of the bladder and decreased sexual function.

马尾神经综合征的症状，包括排便和膀胱控制能力；这是由于肛门括约肌和膀胱壁肌肉张力下降引起的，以及性功能下降。

Certain species of crabs and pearlfish take advantage of this rhythmic action and, once the sea cucumber's anus is dilated, they shimmy in and take shelter.

某些种类的螃蟹和珍珠鱼利用这种有节奏的动作，一旦参的肛门扩张， 它们就会潜入并躲避。

We — and all animals from the simplest worms on up the Tree of Life — are really just tubes, corridors of tissue running from a mouth to an anus.

我们——以及命之树上最简单的蠕虫——实际上只是管子，从嘴到肛门的组织走廊。