- so can only suck up the scraps.
所以只能吸食残渣 - But what it has evolved will change the course of history.
但它进化出的特征将改变历史进程 - It has a new internal skeleton that makes it both fast and agile.
它有一种新的内部骨骼 令它既快速又灵活 - A backbone.
那就是脊椎 - And while it may not look like much,
虽然看起来并不起眼 - fish like Arandaspis
但像阿兰达甲鱼这样的鱼类 - will one day give rise to all other vertebrates.
有朝一日 将导致所有其他脊椎动物的崛起
A backbone. 那就是脊椎
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