Since the rise of agricultural civilizations, our species has colonized every continent on Earth.

自农业文明兴起以来，我们这个物种已经在地球上的每一个大陆上建立了殖民地。

Thus a rich agricultural civilization could easily arise here and survive long enough in relative isolation from the outside world to thrive.

因此，一个富饶的农业文明很容易在这里兴起，并在与外界相对隔绝的环境中生存足够长的时间，繁荣发展。

Everywhere agricultural civilizations of the pre-machine age have changed only slowly with the fluctuations of markets, the fortunes of governments, and the vicissitudes of knowledge, keeping their basic institutions intact from century to century.

随着市场的波动、政府的命运和知识的变迁， 前机器时代的农业文明到处都只是缓慢地发生变化， 几个世纪又一个世纪地保持着它们的基本制度完好无损。