The sand stratum in old river bed is important factor affecting stability of dam.
古河道砂层的存在，是影响围坝稳定的主要环境因素。
In recent years, sand excavation optionally at river bed has brought trouble to some Bridges.
近年来河道大量无序采沙对大桥安全带来了隐患。
In recent years, sand excavation optionally at river bed has brought trouble to some Bridges.
近年来河道大量无序采沙对大桥安全带来了隐患。
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