长江中下游干流河道内的砂石是较好的建筑和填筑材料。
The sand and gravel in the Yangtze river is good building and filling materials.
依据长江下游生态环境特点提出并概算了长江下游干流河道内最小环境需水量。
The paper puts forward and calculates the lowest environmental water demand in river course of stem stream according to the features of ecosystem and environment of lower reach of Yangtze River.
在长江中下游干流河道综合治理工程措施中，护岸工程是一项最基本的整治工程。
During the general works measures of the river regulation in the middle and lower Yangtze river, the channel revetment is a principle engineering of river control.
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