三、怎样正确理解“化学的吸引和排斥”?恩格斯在《自然辩证法》中对辩证法的一般问题,在一段札记中作了具有纲领性意义的表述。他指出:“所谓客观辩证法是支配着整个自然界的,而所谓主观辩证法,即辩证的思维,不过是自然界中到处盛行的对立中的运动的反映而已,这些对立,以其不断的斗争和最后的互相转变或向更高形式的转变,来决定自然界的生活。”接着,他根据当时科学发展的水平用无机界、有机生命和人类历史中的事实进一步说明“对立中的运动”在客观世界中 Third, how to correctly understand the “chemical attraction and exclusion”? Engels made a remark of programmatic significance to the general problems of dialectics in “Dialectics of Nature” in a paragraph of notes. He pointed out: “The so-called objective dialectics dominate the entire natural world. The so-called subjective dialectics, that is, the dialectical thinking, are merely the reflection of the movement of opposites that are prevalent in nature. With their constant struggle and the final Changing one another or moving to a higher form to decide the life in nature. ”Then he further elaborated on the basis of the scientific development at that time the facts in the inorganic, organic and human history that“ the movement of opposites ”is in the objective world