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【简答题】
"旅游是人类自身进化和在社会历史发展历程中产生的。就个体而言，旅游者的产生，是追求自身价值实现的文化意识和经济条件成熟的结果。"针对此言论，请展开分析旅游的本质属性。
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According to the article, one reason for the discovery of new diseases is ____.
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