yet just like in today's forests... 但就像今天的森林中一样
Today's crocodiles dominate the waters they live in... 今天的鳄鱼主宰着其生活的水域
Today's reptiles are such experts at living in the margins, 今天的爬行动物如此擅长在边缘生存
Today's redwoods are nature's skyscrapers. 今天的红杉是大自然的摩天大厦
close relatives of today's deep-sea nautilus. 今天深海鹦鹉螺的近亲
Ancestors of today's octopus and squid, these tentacled giants 这些触须巨兽 是今天章鱼和鱿鱼的祖先
of all yesterday's and today's plant species. 的关键祖先
David: But, you can't actually test this theory, because today's particle accelerators are nowhere near powerful enough to simulate these conditions. 但我们仍无法测试这个理论，因为现在的粒子加速器远不能模拟出这些情况。