年度变化贡献率的计算显示肝炎对发病率下降的贡献最大，淋病对发病率上升的贡献最大；

According to the calculated annual change contribution ratio, hepatitis contributed the most to the decline of the incidence rate, whereas blennorrhea contributed the most to the increase.

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另一方面，随着生产力水平的提高和其他因素的影响，人类活动对耕地变化的贡献率不断增大，耕地变化影响因子的作用也存在明显的时间差异。

On the other hand, with enhancement of productive forces and change of other affecting factors, the proportion of human activities affecting on cultivated land continuously increases.

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