This is what's really complicated, that there were people living in places like the Grand Canyon, cooperating with each other, or on the savannahs of Africa, or on the frozen shores of Alaska, and then some of these villages grew into the mighty cities of Babylon, and Rome, and Tenochtitlan.
何が 不思議かと言えば グランド・キャニオンや アフリカのサバンナや アラスカの氷着岸に共同体があったことや バビロンやローマのような都市が登場したことです