Twenty million years later, life faced one of its greatest challenges... 2000万年后 生命面临又一个巨大的挑战

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later twenty challenges life million greatest faced of its one years
  1. Amphibians, reptiles, mammals, and birds.
    两栖动物、爬行动物 哺乳动物以及鸟类
  2. But for now, vertebrates are only at the beginning
    但是现在脊椎动物仍处于
  3. of a very, very long journey.
    漫长旅程的起始阶段
  4. Twenty million years later, life faced one of its greatest challenges...
    2000万年后 生命面临又一个巨大的挑战
  5. ...as the climate suddenly began to cool...
    气候突然变冷
  6. ...a development that was to have dire consequences.
    这将带来可怕的后果
  7. Little by little, the sea started to freeze.
    海洋逐渐开始冰冻

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 166 行

Walden21
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