oxygen levels plummeted... 氧含量锐减

351. There was nowhere to hide from the chaos.
     一片混乱 无处可藏
352. And the oceans were worst affected.
     海洋受到的影响最为严重
353. As they warmed and acidified,
     随着海洋变暖和酸化
354. oxygen levels plummeted...
     氧含量锐减
355. turning the seas, where life first took hold,
     最早孕育生命的海洋
356. into a desolate graveyard.
     变成了荒芜的坟场
357. This was the planet's third,
     这是地球上第三次

来自《我们星球上的生命 第一季 第三集 Life on Our Planet S01E03 入侵大地》第 354 行