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

这些副交感神经使直肠收缩，并使肛门内括约肌松弛。

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

但是自然界充满了例外，奇怪是，有些动物失去了肛门。

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

海蛇尾和许多寄生虫祖先有肛门，但现在已经没有了。

He'd enjoy them when they came out.

他很喜欢把他们从肛门里排出来感觉。

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。

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

尽管动物王国肛门种类繁多，但没有一个肛门是有骨头。

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

在生命在地球上 30 亿多年旅程中，肛门进化在不同生命分支中独立发生了许多次。

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，成为正常菌群一部分。

The medical terms are things like a Nismus.

医学术语包括诸如肛门痉症。

And so over 40 treatments of radiation and they put a balloon up your butthole.

因此，进行了超过40次放射治疗，他们还在你肛门里放置了一个气球。

They can drink from their mouth or they can drink from their hind end.

它们从嘴里喝水，也从肛门喝水。

Or had your butt plug unexpectedly taken over by Ukrainian hackers?

或者你肛门扩张器意外地被乌克兰黑客接管了？

Suffice to say, it looks like what would happen -if an oyster had a butthole.

说，这看起来就像是牡蛎长了肛门会发生情况。

It was rectal surgery as far as I was concerned.

在我看来，那简直就像是做肛门手术一样痛苦。

Like if you're scared to get cancer, what's the place you're scared to get the cancer the most?

就像如果你害怕得癌症，那么你最害怕得癌症地方是哪里呢？当然是肛门癌。

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

专门管脚用于进食和呼吸，尽管许多海参实际上是通过肛门呼吸。

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

治疗疾一般行根治手术，切除神经纤维缺失肠段，然后将剩余肠段健康一端连肛门。

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

海参本质上是一种无脑肉质形式， 围绕着消化道，由嘴巴和肛门构成。

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，倏一刀直剖到它下颌尖端。