The topic of story mapping isn't a new one for Jeff. He wrote about it in 2005 and again in 2008.

故事图的话题于Jeff并不是第一次了，他在2005年和2008年都讲过一次。

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This indicates: finding of the structure similarity is more difficult than finding of the surface similarity in the analogical-mapping story; the structure is the basic of the analogical problem.

这表明在类比映射中结构相似性比表面相似性更难提取，但结构相似是类比问题解决的基础。

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