In certain location things were dominated by certain cereals; rice in Asia, wheat in Europe, sorghum and millet in Africa, and maize in the New World.

不同的地方有不同的主食,比如,亚洲主食米饭,欧洲主食小麦,非洲主食高粱和小米,美洲主食玉米

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选