On the basis of this, the existence of optimal risk control strategy is proved.

在此基础上，证明了最优风险控制策略的存在性。

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Furthermore, the existence of optimal risk control strategy is proved.

在此蒸础上，证明了最优风险控制策略的存在性。

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Furthermore, the existence of optimal risk control strategy is proved.

在此蒸础上，证明了最优风险控制策略的存在性。

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