In the Middle Ages the yield of wheat of an acre of land in England was fourfold, to-day it is ten to twenty fold, and in addition to that five times more land is cultivated.

 
  • 英国小麦每英亩的产量,在中世纪时已比前增加到四倍,现在已增加到十倍至二十倍,此外耕地面积也已扩大到五倍以上。
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