The mathematical model derived by this method proves to be simple and of practical significance, thus creating good conditions for making optimal designs.

用这种方法导出的数学模型经证明是比较简单的，并且具有实用价值，从而为进行最佳设计创造了良好条件。

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Federal policies creating sound conditions for a highly functioning education system make sense, even if those policies cannot guarantee good execution.

FORBES: The Wisdom, Risks, and Foolishness of Race to the Top