- Graced with a look of permanent surprise,
外表永远是一副惊讶的样子 - this is Arandaspis...
这就是阿兰达甲鱼 - an early kind of fish.
一种早期鱼类 - It hasn't yet evolved a jaw,
它尚未进化出颌 - 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
It hasn't yet evolved a jaw, 它尚未进化出颌
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