- 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 - Little by little, the sea started to freeze.
海洋逐渐开始冰冻 - For the inhabitants of Earth's once tropical waters,
过去地球上热带水域的“居民们” - this was a catastrophe.
大难临头 - The shallow seas became a frozen graveyard.
浅海变成了冰冻的坟墓