which they ruled undisturbed for the next 40 million years. 在之后的4000万年 不受滋扰地统治着陆地
But they were more than just pioneering. 但它们不仅具有开创性
but they are in fact completely unique. 但它们其实独一无二
They were carried there from the land... 而是来自陆地
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
But they owe their rise to the fall of their greatest rivals. 但它们的崛起归功于 最强大竞争对手的灭亡