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

尽管动物王国的肛门种类繁多，但没有一个肛门是有骨头的。

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呼吸，尽管许多海参实际上是通过肛门呼吸的。

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

生球上 30 亿多年的旅程中，肛门进化不同的生分支中独立发生了许多次。

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

痔疮是肛门直肠附近的肿胀静脉，会引起疼痛并导致瘙痒出血。

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——SciShow 评论最喜的术语——肛门的发育方式有关。

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

他用一只脚踩鱼身上，从肛门朝上，倏的一刀直剖到它下颌的尖端。

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——以及生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。

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.

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

Oxygen from the air enters the blood through capillaries in the walls of these air spaces, and the blood release carbon dioxide into the air spaces to be exhaled.

消化系统由从口腔延伸到肛门的管道组成。

In fact, the enteric nervous system, which is an extensive mesh-like network of neurons that controls your entire digestive tract from the esophagus to the anus, doesn't even require the brain at all.

事实上，肠道神经系统是一个由神经元组成的网状网络，控制着从食道到肛门的整个消化道，它甚至不需要大脑控制。

By loosening the attachments of internal tissues then quickly softening and contracting their muscles, many species are capable of shooting a wide range of organs out of their anuses.

通过松开内部组织的附着物，然后迅速软化收缩它们的肌肉，许多物种都能够从它们的肛门中射出范围广泛的器官。

In fact, the enteric nervous system, which is an extensive mesh-like network of neurons that controls your entire digestive tract from the esophagus to the anus, doesn’t even require the brain at all.

事实上，肠神经系统是一个广泛的网状神经元网络，控制着从食道到肛门的整个消化道，它甚至根本不需要大脑。

So, for instance, there's no evidence that oral and anal characteristics, the personality characteristics I talked about – about being needy versus being stingy – relate in any interesting way to weaning or toilet training.

因此，例如，没有证据表明口腔肛门的特征，我谈到的性格特征——关于需要吝啬——以任何有趣的方式与断奶或如厕训练相关。

Now, I'm quite sure that you're familiar with the key players here — they're the hollow organs that form the continuous tube that is your alimentary canal, aka the gastrointestinal tract, which runs from your mouth to your anus.

现，我很确定你对这里的关键选手很熟悉——它们是形成连续管子的中空器官，也就是你的消化道，也就是胃肠道，从你的嘴延伸到你的肛门。

In your mouth, in your esophagus, and at the other end of things, at your anus, you have stratified squamous epithelial tissue, just like your epidermis, to help resist the abrasive action of like, chewing, like corn chips, maybe.

你的嘴里，你的食道里，东西的另一端，你的肛门里，你有分层的鳞状上皮组织，就像你的表皮一样，帮助抵抗研磨作用，比如咀嚼，比如玉米片，也许。

If it starts to rot, or you start to snack on this body, you'll have to cover the stench of decomposition with your own anal secretions so that other hungry, desperate, overworked parents don't come looking for your lunch.

如果它开始腐烂， 或者你开始这个身体上吃零食，你就必须用你自己的肛门分泌物来掩盖腐烂的恶臭， 这样其他饥饿、绝望、过度劳累的父母就不会来找你的午餐了。