Human knowledge has three forms of existence, i. e., the form of consciousness, the form of marks and the form of substance.
人类的知识有三种存在形式：意识形式、符号形式、物化形式。
Human knowledge has three forms of existence, i. e., the form of consciousness, the form of marks and the form of substance.
人类的知识有三种存在形式：意识形式、符号形式、物化形式。
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