从历史上看，缺氮，不缺土地或不缺水，一直是农业最大的制约因素。
Historically, lack of nitrogen, not lack of land or water, has been its biggest constraint.
你知道我们国家农业税的历史吗？
Do you know something about the history of agricultural tax in our country?
农业有很长的历史。
农业在中国历史悠久。
黄泛平原在历史上一直是我国的主要农业区。
It has been the main agriculture region of China in Huangfan Plain from ancient times.
黄泛平原在历史上一直是我国的主要农业区。
It has been the main agriculture region of China in Huangfan Plain from ancient times.
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