Erosion, dilation, opening operation and closing operation are the basis of mathematical morphology.

膨胀、腐蚀、开运算、闭运算是数学形态学的基础。

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The compilation of this map provided scientific basis for controlling soil erosion of sloping cultivated land and its rational utilization in the region.

该图的编制为治理本区坡耕地水土流失、合理利用坡耕地资源提供了科学依据。

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To establish a predicting model of slope erosion modulus and gully erosion modulus on the basis of special definition for the meanings of slope erosion, gully erosion and gully gravity erosion.

在特别界定小流域“坡面侵蚀”、“沟道侵蚀”和沟道“重力侵蚀”词语含义的基础上，建立起坡面侵蚀模数和沟道侵蚀模数的预报模型。

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"I urgently and earnestly call on the Congress today to reassess the erosion that has taken place in our diplomatic readiness and to support, on a bipartisan basis, the president's international affairs budget, " he continued.

CNN: Secretary Of State Christopher Says Farewell