Theory means to abstract and summarize objective realities or phenomena, whose basic aspect is concept, through it to arrange and study knowledge properly.
理论是对客观现实（现象）的抽象和概括，理论最基本的方面是概念，通过它对知识进行有条理的编排和研究。
The truth of any knowledge or theory is determined not by subjective feelings, but by objective results in social practice.
判定认识或理论之是否真理，不是依主观上觉得如何而定，而是依客观上社会实践的结果如何而定。
The truth of any knowledge or theory is determined not by subjective feelings, but by objective results in social practice.
判定认识或理论之是否真理，不是依主观上觉得如何而定，而是依客观上社会实践的结果如何而定。
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