我国玉米种植面积和产量仅次于水稻。
The planting area and yield of Maize is only inferior to rice in China.
有担心usda可能会增加美国2011年玉米种植面积。
Some fear that USDA could increase US 2011 corn acres from last year.
定义每公顷玉米种植面积上所饲养的奶牛数量称为养殖密度。
The number of cows per hectare corn farmers is called as breeding density.
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