First, they share a common origin: They all develop from mesenchyme, a loose and fluid type of embryonic tissue.

首先，它们都有一个共同的起源：它们都是由间充质（一种松散而流动的胚胎组织）发展而来的。

But that was not true of human hypoblast or extra-embryonic mesenchyme cells, both of which behaved more like monkey cells.

但内胚层或胚外间充质细胞中的人类细胞的行为却都更像猴子细胞。