yield of food crop 粮食作物产量
Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.
更好的灌溉可以显著提高作物产量；目前，全球约40%的粮食供应都来自于灌溉地。
But no matter how much we maximize crop yield per acre, the limiting factor for food production is land.
但是不管我们如何最大化粮食亩产量，最大的制约因素还是土地。
This paper analyses the crop productivity and livestock productivity yield and food supply, on the other hand, we researches the food demand.
在分析该区植物性产品和动物性产品产量以及粮食总供给量的同时，研究了粮食需求量。
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