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德国化学家李比希说过这样的话:“化学正在取得异常迅速的成就,而希望赶上它的化学家们则处于不断脱毛的状态。不适于飞翔的旧羽毛从翅膀上脱落下来,而代之以新生的羽毛,这样飞起来就更有力更轻快。”恩格斯在1885年为《反杜林论》第二版写的序言中,引用了李比希关于“脱毛”的说法,谈到他曾用了8年当中大部分时间钻研自然科学的最新成就,使自己在知识更新上来了一个彻底的“脱毛”。正是凭着这种脱毛换羽的求知精神,恩格斯写出了《反杜林论》、《自然辩证法》等不朽巨
German chemist Lee Bixi has said: “Chemistry is making exceptionally rapid progress, and chemists who want to catch it are constantly shedding hair. The old feathers, unsuitable for flying, fall off their wings and are replaced by Newborn feathers, which fly faster and more forcefully. ”In his preface to the second edition of Anti-Dühring in 1885, Engels quoted Liebig’s statement about“ hair removal, ”referring to his use of 8 Most of the year studying the latest achievements of natural science, so that they have a complete update on the knowledge of “hair removal.” It is by virtue of this spirit of knowledge of depilating and plumage that Engels wrote immortal giant such as Anti-Duhring and Dialectics of Nature.