The total area of cultivated has increased.
总耕地面积有所增加。
The result show that: steady grain total output is directly proportional to steady cultivated area;
研究结果表明：稳定的粮食产量与稳定的耕地面积成正比；
The result show that: steady grain total output is directly proportional to steady cultivated area;
研究结果表明：稳定的粮食产量与稳定的耕地面积成正比；
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