We belong to a class of organisms called deuterostomes.

我们属于后口动物。

So, these scientists think S. coronarius could be one of the earliest deuterostomes, based on comparisons of more than 60 features to other living creatures and fossils.

因此，这些科学家认为皱囊虫可能是最早的后口动物之，这是基于将超过60特征生物和化石进行比较得出的论。

Fruit flies and humans are on opposite sides of a 670m-year-old division splitting bilaterally symmetrical animals into two groups: protostomes and deuterostomes.

果蝇和人类位于 670 历史的分区的对立面，将双侧对称的动物分为两组：原口和后口。

This separation almost certainly predates the evolution of brains, meaning the brains of insects (which are protostomes) and those of vertebrates (deuterostomes) have separate origins.

这种分离几乎肯定早于大脑的进化，这意味着昆虫（原口动物）的大脑和脊椎动物（后口动物）的大脑有不同的起源。

The most widely-used definition of deuterostome has to do with how our mouths and — the SciShow comments’ favorite term — anuses develop.

后口动物最常用的定义我们的嘴巴和——科学秀评论区最爱的术语——肛门是如何发育有关。

We’re all what biologists call deuterostomes, a classification that has to do with how we develop as embryos.

我们都是生物学家所说的后口动物，这是种我们胚胎发育方式有关的分类。

In fact, the earliest deuterostomes might share common traits like openings that they used to help with filter feeding.

事实上，最早的后口动物可能有些共同的特征， 比如们用来帮助过滤式摄食的开口。