With the advance of the frontier, corn and wheat supplanted them both in agrarian economy.

随着边疆的推进，玉米和小麦在农业经济中取代了它们。

The global demand for quinoa, a grain indigenous to South America, surged so profoundly that it reshaped the agrarian economies of Bolivia and Peru.

全球对藜麦（一种原产于南美洲的谷物）的需求大幅增长，重塑了玻利维亚和秘鲁的农业经济。