The individual units resemble vertebrae in the human spine.

每个单独的单位类似于人类脊椎的椎骨。

The first animals to develop a backbone were fishes.

第一种进化出脊椎的动物是鱼类。

Again, just starting right there at the base of the spine.

同样，从脊椎的底部开始。

It's the longest stretch of your spinal column that is shown.

它是脊椎最长的部分。

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。

The rods bridged the break at the top of Ricky's backbone.

这些长棒连接了瑞奇脊椎顶端的断裂处。

In fact Ricky wants to work with other people that have injuries to their backbones.

事实上，瑞奇想帮助其他脊椎受伤的人。

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

陆地脊椎动物，即有脊骨或脊椎的动物，出现在大约3。75亿年前。

Your head, your spine, everything else wants to keep going in a straight line.

而你的头，你的脊椎，所有的东西想继续走直线。

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

大约3。75亿年前，陆地脊椎动物，也就是有脊骨或脊椎的动物，开始出现。

A worm doing the backstroke might be the reason your spine runs down your back.

那只做仰泳的蠕虫可能就是为什么你的脊椎沿着背部往下的原因。

But Bajadasaurus spine's made of the same keratin material as our horned animals of today.

但是巴雅达龙的脊椎和我们今天的角化动物是由同样的角蛋白材料制成的。

That is basically what it means to be a vertebrate.

这基本上就是脊椎动物的含义。

Pterosaurs were the first vertebrates to master flight.

翼龙是最早掌握飞行的脊椎动物。

Their vertebrae are about 25 centimeters.

它们的脊椎长约25厘米。

Each back bone, or vertebra, weighs more than 100 kilograms.

每根脊椎骨的重量超过100公斤。

You're embarrassing me. Oh, don't be embarrassed. I'll show you the divot in my spine.

你让我好尴尬。噢，别害羞嘛。给你看看我脊椎里的凹陷。

It was likely killed by a severe break of its backbone.

它可能是死于脊椎骨的严重断裂。

So invertebrate animals are animals that don't have a backbone.

所以无脊椎动物是没有脊椎的动物。

My spine was chipped in eight places. Four ribs were broken.

我的脊椎有八处碎裂。断了四根肋骨。