然后，应用最优控制理论得出慢时间尺度上的解，并将其作为降维后的最优参考轨迹；
Then, through solving the slow time-scale problem by optimal control theory, the optimal reduced-order reference trajectory is obtained.
受作物本身生理机制以及近地层气象因子非线性、非平稳化随机变化的影响，参考作物腾发量在时间尺度上具有自相似性特点。
Influenced by crops' physiological mechanism and the unsteady, non-linear stochastic variation of meteorological factors, reference evapotranspiration is characterized by its stochasticism.
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