Gave way to the most productive varieties and the easiest to transport. 被更高产的变种且方便运输的产物取代
Crops adapted to soils and climates... 顺应土质和气候的庄稼
Similar to the mother cell that is shared by all forms of life. 这些细胞和所有生物共享的母细胞相似
Was what to do with the surpluses engendered by modern agriculture. 如何处理现代农业带来的过剩盈余
But most of that grain is not used to feed people. 但大多数粮食没有用来养活人口
They produce enough grain to feed two billion people. 他们生产的粮食可以养活20亿人
America was the first to discover, exploit and harness... 美国第一个发现 开采 并掌握了
The earth supplies to human genius. 利用地球提供的能源的标志
And over two billion people have moved to the cities. 超过20亿人口涌入城市