Whatcheeria was an early tetrapod, as the first land animals with backbones were known.

瓦切螈是一种早期的四足动物，作为第一批有脊的陆地动物而为人所知。

Things with backbones and skulls can support huge eyes, but jumping spiders are not huge.

有脊骨的东西可以支撑巨大的眼睛，但跳蛛并不大。

Vertebrates are animals with backbones and bones inside their bodies. The bones help to support their bodies.

脊动物是身体里边有脊骨的动物。这些骨来帮助支撑他们的身体。

By human standards, a few vertebrate species have incredible longevity.

按照人类的标准，有一些脊动物的寿命长得令人难以置信。

The researchers say the acanthothoracid was one of the earliest jawed vertebrates with teeth ever to live.

研究人员表示，acanthothoracid是有史以来最早的有牙齿的颚脊动物之一。

The land vertebrates – animals that have a backbone or spine – showed up some 375 million years ago.

大约3。75亿年前，陆地脊动物，也就是有脊骨或脊的动物，开始出现。

At a time when any animals with legs and backbones were still pretty new, temnospondyls did incredibly well for themselves.

在任何有腿脊的动物还很鲜的时候，temnospondyls 自己做得非常好。

All animals with backbones and four legs came from the same common ancestor, who lived about 400 million years ago.

所有有脊四条腿的动物都来自大约 4 亿年前的同一个祖先。

With an efficient new way to take in nearly limitless amounts of oxygen from air, animals were eventually able to get bigger and more diverse over the ages, and now all of us lung-having vertebrates share that common ancestor.

有了一种从空气中吸收几乎无限量氧气的有效方法，随着时间的推移，动物最终能够变得更大、更多样化，现在我们所有有肺的脊动物都有一个共同的祖先。