Unfortunately, Jarvik refused to let anyone study his tetrapod.

不幸的是，贾维克不让别人插手他的研究工作。

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，作为第一批有脊椎的陆地动物而为人所知。

And the situation is very different with other four-legged animals, tetrapods.

这种情况与其它四足动物有非常大的不同。

Today three early tetrapods are known and none has five digits.

今天，已经知道早期有三种四足动物，但没有一种跟数字5有关系。

This was the missing link between bony fishes and tetrapods, including human beings, so this was a fantastic expectation.

这是硬骨鱼和包括人类在内的四足动物之间缺失的一环，所以对我们来说这种期待很奇妙。

Unlike many early tetrapods, bones of Whatcheeria have been discovered from different points in the animal's life.

与许多早期四足动物不同的是，人们发现了瓦切螈不同生命阶段的骨骼。

Your few four-legged ancestors, the tetrapods, struggled in tropical river plains.

你的少数四足祖先， 四足动物，在热带河流平原上挣扎。

One of the earliest of these new creatures was a tetrapod named Acanthostega.

这些新生物中最早的一种 是一种名为棘螈的四足动物。

But, the earliest tetrapods were all carnivorous predators.

但是，最早的四足动物都是肉食性 捕食者。

It was a huge boost for adventurous tetrapods that were colonizing dry land.

这对在陆地上定居的冒险四足动物来说是一个巨大的推动力。