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The instruments of labour, when they assume the form of machinery, acquire a kind of material existence which involves the replacement of human forces by the forces of Nature, and of rule-of-thumb methods by the purposeful application of natural science.
劳动工具，当它们以机械的形式出现时，就获得了一种物质的存在，这种物质的存在包括用自然的力量代替人的力量，以及有目的地应用自然科学的经验法则的方法。