Over the last century, across many countries and many different crop types, crop yields have skyrocketed.

上个世纪，许多国家和许多不同作物类型的作物产量猛增。

Instead of crossing a few plants together to try for a new variety, Borlaug crossed thousands and thousands, using crop types from all over the world.

不是仅仅将少数植物杂交到一起尝试新品种，博洛格使用来自世界各地的作物类型杂交了成千上万种作物。