Computation of erosion and deposition on the bed surface is a foundation of predicting bed variations in rivers, estuaries and seas.
冲淤计算是河流、河口、海岸等水域中分析、预测床面变化的基础。
The functional requirements on surface layer of foundation bed for high-speed rail-ways are rather more strict than for ordinary railways.
和常规铁路相比，高速铁路对基床表层功能的要求更加严格。
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