Among them is a relationship of dialectical unity.

它们之间是辩证统一的关系。

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Shortage "and" Surplus "are the two poles of a dialectical unity."

短缺和过剩是既对立又统一的矛盾的两极。

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Mathematics is a dialectical unity of logic and inductive procedures.

数学是逻辑程序与归纳程序的辩证统一。

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