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于做学问和研究 ——要持批评和怀疑的态度：重新估定一切价值，一切论断都要拿证据来。“宁可疑而错，不可信而错。”要多研究些问题，少空谈些主义和概念。要搜集广博的材料，用科学精密的方法，进行系统的研究。对于个人，要养成一种批评的态度，研究的兴趣，独立思想的习惯。
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