如何想象不可想象之物

Now I understand that the more completely the dinosaurs were annihilated, the wider their domain extended. They not only controlled the forests that covered the continents, but also penetrated into the depths of human thought that remained on Earth. Starting from the ancient, fear and doubt inducing ancestors, they continuously stretched out their necks and raised their claws, expanding their domain.（Calvino "The Dinosaurs."）