以下为句子列表：
英文: The optimal control model is established by aiming at the life insurance policy in which the insurance is paid at one time or upon death, and the optimal payment method is obtained by solving the model and discussing, so that the optimal strategy is fond
中文: 摘要以趸激保费、即死即付保险金的全连续的定期寿险保单为研究对象，建立了给付保险金的最优控制模型，并通过对模型的求解及讨论得出了最优保险金给付形式，从而找出了投保人的最优策略。
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英文: With the operational research and system technology theory, an optimal control model of groundwater is solved by differential dynamic programming (DDP) algorithm.
中文: 摘要基于运筹学和系统工程学的基本理论，建立了地下水最优控制模型，并采用微分动态规划方法进行求解。
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