A sudden surge in ocean nutrients 海洋养分激增

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
346. But now, they would almost bring it to an end.
     但是现在 它几乎将动物生命带入终结
347. A sudden surge in ocean nutrients
     海洋养分激增
348. caused the population of plankton to increase...
     导致浮游生物数量增加
349. on an unprecedented scale.
     规模空前
350. As it spread through the sunlit shallows,
     当浮游生物遍布阳光照耀的浅水时

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 347 行