But Dunkleosteus was to suffer from a devastating quirk of fate... 但邓氏鱼即将遭受毁灭性打击

339. and Dunkleosteus had reigned for 20 million years.
     邓氏鱼已经统治了2000万年
340. So vicious a predator
     它们是如此凶悍的捕食者
341. that not even early sharks could compete.
     以至于早期的鲨鱼也无法与之匹敌
342. But Dunkleosteus was to suffer from a devastating quirk of fate...
     但邓氏鱼即将遭受毁灭性打击
343. ...caused by plankton.
     这一切都源于浮游生物
344. Billions of years earlier,
     数十亿年前
345. plankton had been the catalyst for animal life.
     浮游生物是动物生命的催化剂

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 342 行