translation.en: What we had failed to understand was that these seasonal humidity environments of the world, the soil and the vegetation developed with very large numbers of grazing animals, and that these grazing animals developed with ferocious pack-hunting predators.
translation.zh: 我们过去不了解的是 世界上这些季节性雨水充沛的环境中 伴随着植被的蓬勃生长 数量可观的游牧食草动物也随之而来， 而这些游牧的动物 又引来了凶猛的猎食者。