由此为山前洪积扇研究提供了新的方法和线索。
So the size statistics given a new method to study the diluvial .
北京西山东麓和北山南麓广泛分布着山麓洪积扇地形。
The piedmont alluvial fans widespread on the east side of Xishan and the south side of Beishan.
张家口冲-洪积扇区地下水中的硝酸盐含量逐年升高。
The Nitrate concentrations in groundwater in the alluvial - diluvial fan of Zhangjiakou area has increased year by year.
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