根据事物不同性质，矛盾的性质也随之变化。

Contradictions differ in accordance with the different nature of different things.

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敌我之间和人民内部这两类矛盾的性质不同，解决的方法也不同。

Since they are different in nature, the contradictions between ourselves and the enemy and the contradictions among the people must be resolved by different methods.

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引入关键矛盾和矛盾流的概念，研究了关键矛盾的性质，提出解决矛盾问题的关键矛盾法。

The concepts of key contradiction and contradictory flow are introduced. Some properties of key contradiction are studied. The key contradiction method for solving non compatible problems is proposed.

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