There are many complicated factors influencing the quantity of cultivated land, so a simple regression analysis can not achieve a satisfactory model.

影响耕地数量变化的因素错综复杂，简单的回归分析不易得到满意的模型结果。

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There are many complicated factors influencing the quantity of cultivated land, so a simple regression analysis can not achieve a satisfactory model.

影响耕地数量变化的因素错综复杂，简单的回归分析不易得到满意的模型结果。

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