本文试图从河流地貌学与历史地貌学的角度，对淮河流域洪涝灾害的成因进行初步的分析。
The paper attempted to make a preliminary analysis to causes of flood in the Huai river region from the angle of the river morphology and historical morphology.
本文对壶瓶山自然保护区植物区系特征及成因进行了初步分析。
This paper analyses the characteristics of flora and the causes of formation in Huping mountains.
本文依据考古资料及历史文献资料，对其墓葬的形制、年代、成因、意义等方面进行了初步分析。
According to archaeological and historical documents, the article analyses the form, date, cause and significance of the tomb.
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