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

这是因为它们是从海底螅体中产生。

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螅，对这个生物，毕加索称之为坨屎。

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

但螅有弥漫脑细胞构成神经网络，而不像我们有个密集器官。

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

珊瑚由称为螅体微小透明动物组成，每个块中有数千个。

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

在螅生命期任何时候都没有观察到生育率下降或死亡率增加。

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

看，螅身体真很简单：个头和只脚沿着个身体轴排成行。

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

螅有细而平行肌动球蛋白纤维遍布全身，就像我们肌肉组织。

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

螅体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次。

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。

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螅虫子。

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.

像些巨型龟寿命能活到将近两百岁，还有些螅属淡小动物，它们看起来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.

另方面，形状像闭环螅切片折叠得不太好， 形成了不同区域肌动球蛋白以不同方式排列球体。

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.

这种螅是种厘米长淡螅体，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， 它几是不朽。