- will one day give rise to all other vertebrates.
有朝一日 将导致所有其他脊椎动物的崛起 - Amphibians, reptiles, mammals, and birds.
两栖动物、爬行动物 哺乳动物以及鸟类 - But for now, vertebrates are only at the beginning
但是现在脊椎动物仍处于 - of a very, very long journey.
漫长旅程的起始阶段 - 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 - ...as the climate suddenly began to cool...
气候突然变冷 - ...a development that was to have dire consequences.
这将带来可怕的后果
of a very, very long journey. 漫长旅程的起始阶段
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