an early kind of fish. 一种早期鱼类

151. Although, there is another important new arrival.
     但是还有另外一个重要的新来者
152. Graced with a look of permanent surprise,
     外表永远是一副惊讶的样子
153. this is Arandaspis...
     这就是阿兰达甲鱼
154. an early kind of fish.
     一种早期鱼类
155. It hasn't yet evolved a jaw,
     它尚未进化出颌
156. so can only suck up the scraps.
     所以只能吸食残渣
157. 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

来自《我们星球上的生命 第一季 第二集 Life on Our Planet S01E02 第一前线》第 154 行