Du Yucai's dialect study paid attention to the comparison. Its materials and methods were for reference to Chinesehistory and modern Chinese dialect study.

段玉裁的方言研究注重目验和历时、共时的比较，其材料及方法可供汉语史和现代汉语方言研究参考。

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The works related Buddhism in Du Fu's poems were the important materials of studying Du Fu's thoughts.

杜诗中与佛教有关的作品是研究杜甫思想的重要资料。杜甫对佛教的认识有一个由浅入深的过程。

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Through checking historical materials, it points out that the descriptions about the upper course of the Yellow River in various Yuan documents all stemmed from Du Shi.

通过对有关史料的分析和考察，指出元人关于黄河上游及河源地区地理情况的各种记载和描述均来源于都实。

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