Heat that comes from small warm-blooded mammals. 来自小型温血哺乳动物身上的热痕迹
so too did the snakes that fed on them. 以之为食的蛇也兴盛起来
...but they had evolved jaws that could chew. 但它们已经进化出能够咀嚼的颌部
animals that were evolving just beneath their feet. 这些动物正在它们脚下进化
But it wasn't just the smaller creatures that were changing 但发生巨变的
that, for the very first time in Earth's history, 以至于陆地上的物种数量超过海洋
that is still very much with us today. 这种创新今天仍然存在
...in ways that would revolutionize life on Earth. 这样的改变将为地球上的生物 带来革命性的变化