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在学习总路线以前,我们就认识到人类的生产活动是人的认识发展的基本来源,离开了农业生产劳动的实践,不可能得到生物科学的知识
Before we study the general line, we have realized that the productive activities of mankind are the basic sources of human cognition and development. We can not get the knowledge of biological sciences without the practice of agricultural production and labor