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的肉质形式， 围绕着消化道，由嘴巴和肛门构成。

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。