This is because they are spawned from polyps on the seabed.

这是因为它们是从海底水螅中产生。

He's also a polyp, bristling and squishy, a creature Picasso himself called a turd.

他本人则像只竖着刚毛粘乎乎水螅，对这个生，毕加索称之为一坨屎。

But hydra have neural nets of diffuse brain cells, rather than a dense organ-like we have.

但水螅有弥漫脑细胞构成神经网络，而不像我们有一个密集器官。

See, hydra bodies are really simple: one head and one foot lined up along a single body axis.

看，水螅身真很简单：一个头和一只脚沿着一个身轴排成一行。

Coral is made of tiny transparent animals called polyps, with thousands of them in each chunk.

珊瑚由称为水螅小明成，每个块中有数千个。

Hydra have thin, parallel actomyosin fibers running throughout their body, like our muscle tissue.

水螅有细而平行肌球蛋白纤维遍布全身，就像我们肌肉织一样。

No decline in fertility, or increase in mortality, was observed at any point in the hydra life cycle.

在水螅生命周期任何时候都没有观察到生育率下降或死亡率增加。

And even though hydra regeneration is a little more extreme, it’s similar to how we humans heal wounds and develop as embryos.

尽管水螅再生有点极端，但它类似于我们人类治愈伤口和发育成胚胎方式。

Every cell in a hydra’s body is replaced every three to four weeks, by fresh cells produced by brand new stem cells.

水螅内每个细胞每三到四个星期就会被全新干细胞产生新鲜细胞更换一次。

But unlike butterflies, if Turritopsis get wounded or if times get tough, they can morph backwards, reverting to their immature polyp form until conditions improve.

而与蝴蝶不同是，如果受伤或者生存条件恶劣，灯塔水母们可以回到之前阶段，在状况改善之前变回它们非成熟期时类似水螅虫样子。

Like some giant tortoises that can reach near 200 years and some small freshwater animals of the genus Hydra that appear not to age at all.

像一些巨型龟寿命能活到将近两百岁，还有一些水螅属淡水小，它们看起来一点也没有走向衰老痕迹。

On the other hand, slices of hydra shaped like closed rings didn’t fold so well, and formed spheroids with different regions of actomyosin aligned in different ways.

另一方面，形状像闭合环水螅切片折叠得不太好， 形成了不同区域肌球蛋白以不同方式排列球。

In addition to their characteristics, in these cnidarians, there's the leap of the formation of a third layer of tissue during development, from the polyp state to certain jellyfish, such as some that belong to the taxon of hydromedusae.

除了它们特征，在这些刺胞之间，在发育过程中，还有第三层织形成飞跃，从息肉状态到某些水母，比如一些属于水螅纲水母。

This hydra is a freshwater polyp that’s a centimeter long, and reproduces both asexually and sexually, can regenerate after it’s been cut into pieces, including being able to regenerate its ENTIRE HEAD, and, as it turns out, is pretty much immortal.

这种水螅是一种一厘米长淡水水螅，可以无性繁殖和有性繁殖， 在被切成碎片后可以再生，包括能够再生它整个头部， 而且事实证明， 它几乎是不朽。