因此，非常有必要对随机泛函微分包含解的存在性，可控性和泛函微分方程周期解的存在性问题进行研究。
It is necessary for us to study the existence and controllability of the solution of stochastic differential inclusions and the existence of periodic solutions for functional differential equations.
因此，非常有必要对随机泛函微分包含解的存在性，可控性和泛函微分方程周期解的存在性问题进行研究。
It is necessary for us to study the existence and controllability of the solution of stochastic differential inclusions and the existence of periodic solutions for functional differential equations.
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