为评估增雨对农业的影响，利用自然降水对农作物产量贡献的积分回归，获得降水对农作物贡献系数。

For assessment effect of cloud seeding for agriculture, contribution coefficient of precipitation to crop production was obtained using integral regression of precipitation.

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根据周期任务和非周期任务对系统风险系数的贡献不同，提出了两层任务分配策略；

The two-level tasks allocation strategy of cycle tasks and un-cycle tasks was put forward because their contributions are difference for the risk coefficient of system.

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文中考虑了材料的相对导磁系数对材料复数折射率的贡献，使分层介质系统的光学迭代法更具普遍性；

The optical recursive formula for stratified medium system becomes more general with the contribution of relative magnetic permeability to the complex refractive index.

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