马克思关于“无产阶级必须解放全人类才能解放自身”的命题是一个存在论命题。其中的“自身”, 以往译成“自己”是不确切的。德语词“Selbst”的汉译词有“自我”、“自己”、“自身”等, 但在马克思存在论意义上, 用“自身”才能得到确切的理解。因为“自己”、“自我”的意义, 主要是在意识层面上呈现的, 而马克思的“自身”则是在存在之活动境域中呈现的, 所谓“阶级自身”也就是在整个人类历史活动境域中呈现的。 Marx’s proposition that “the proletariat must liberate all mankind to liberate itself” is an ontological proposition. One of the “own”, previously translated as “self” is not precise. The Chinese translations of the German word “Selbst” are “self”, “self” and “self”, but in the Marxist theory of ontology, “self” can be used to get an accurate understanding. For the meaning of “self” and “self” is mainly presented on the level of consciousness, and Marx’s “self” is presented in the context of the activity of existence. The so-called “class itself” means the entire history of human activities Presented.