由此人们便知道观音洞与永定河相通。
From then on it was known that the Cave connects to the River.
永定河，他盯着前方的一条粼光闪闪的水。
接着，山谷下碧绿的永定河突然出现在眼前。
Then suddenly we saw the green Yongding River in the valley below.
蜿蜒于京城西北的永定河是北京最大的河流。
Winding its way through the northwest of Beijing, Yongding River is the biggest river in the city.
北京平原区永定河地下水系统位于北京市的西部。
The Yongding River groundwater system in Beijing plain is located in western Beijing.
你就是把北京西北的巍峨山脉劈出了深峡长谷的永定河。
You are the same river that carved a long, deep canyon in the towering ranges of hills northwest of Beijing.
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。
The landform on which ancient human activity relic located was interfluvial floodplain on Yongding River Alluvial Fan.
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。
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.
穿过城市的主要河流包括永定河，潮白河，北运河和拒马河。它们大多源于北京东北部的山脉地区。
Major rivers flowing through Beijing include Yongcing river, Chaobai river, north Canal and Juma river that mostly originated in the northeastern mountainous areas of Beijing.
从1871至1904年，周馥曾多次对永定河、潮白河、北运河、滹沱河等直隶河道及黄河、运河、小清河进行勘察和治理，取得了良好的成效。
From 1871 to 1904, many times Zhou Fu have Yongdihe River, Chaobaihe River, North canal, Huruohe River and the Yellow River, ect to reconnoitre and manage, made the. good effect.
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。
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。
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.
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