For example, the growth of population in China, which had been held in check by the shortage of irrigable rice fields, got a boost from new crops that could be grown on marginal soil.

• 曾经由于水田不足而受到抑制的中国人口，在引进了这种在贫瘠的土地中能够生长的作物之后便得到了迅速提高。