The Yongding River groundwater system in Beijing plain is located in western Beijing.
北京平原区永定河地下水系统位于北京市的西部。
Major rivers flowing through the municipality include the Yongding river and the Chaobai river, part of the Hai river system, and flowing in a southerly direction.
流经北京市的主要河流有：永定河，以及朝南流向属于海河水系的潮白河。
It measures wind erosion under the conditions of different wind speed of floodplain area with different vegetation coverage ratio of the Yongding River by using mobile filed wind channel equipment.
利用野外移动式风洞试验装置，对永定河不同植被覆盖率河滩农地在不同风速下的风蚀量进行了测定，结果表明：播草盖沙可以提高起沙风速，有效减少河滩地的土壤流失。
Sudies on the historical forest change in Yongding River Basin have found that Liaojin Dynasty is the turning point.
研究历史上永定河流域森林变迁情况，发现辽金时代是一个转折点。
Yongding River sand land is the largest area of wind-sand land sand and is one of the most severe wind sand damage region in Beijing, Which has important influence to eco-entironment in Beijng.
永定河沙地是北京市面积最大的风沙化土地和风沙危害最严重的地区之一，对北京市的生态环境有重要影响。
The landform on which ancient human activity relic located was interfluvial floodplain on Yongding River Alluvial Fan.
古人类活动遗址所处地貌部位为古永定河冲积扇的河间冲积平原。
Winding its way through the northwest of Beijing, Yongding River is the biggest river in the city.
蜿蜒于京城西北的永定河是北京最大的河流。
Through the investigation on climate, geological condition and human activity of Yongding River Basin, the origin of wind-sandy land in Yongding River Basin was analyzed.
通过对北京市永定河流域气候、地质条件及人为活动的调查，分析了永定河流域风沙化土地的成因。
Then suddenly we saw the green Yongding River in the valley below.
接着，山谷下碧绿的永定河突然出现在眼前。
Lugou Bridge was designed according to the feature of the currents of Yongding River.
卢沟桥是根据永定河水流的特点设计的。
Lugou Bridge was designed according to the feature of the currents of Yongding River.
卢沟桥是根据永定河水流的特点设计的。
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