It would go under like the great reptiles of the saurian age who attempted to control a huge body by a small , centralized nervous system that could not adapt to rapid change in the environment .

这就好像两栖动物时代的巨大爬行动物，它们试图用细小而集中的神经系统来控制庞大的身躯，那必然无法适应环境的剧变。