It's only been with us for less than a century, and in that time, that fourth dimension, when radioactive dating came about, less than a century ago, and we could actually tell how old some of these things were, is probably the most profound transformation, because it changes the way we look at ourselves and the world dramatically.
它的历史不超过百年， 在那时， 不到一个世纪之前，放射性测年技术的发明 使我们能测得这些化石的年龄， 这是一项深远的变革， 它改变了我们看待自己和世界的 方式方法。