Not only has this subject been long associated with the ideas of thinking men over the ages but its practical importance is attested to by the huge resources of men and material thrown into this type of work.
长期以来，这一课题不仅与历代有思想的人的思想联系在一起，而且其实际重要性也得到了投入这类工作的大量人力和物力的证明。
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