grading collocation的用法和样例：
例句
- Grading exploitation of rock-filling materials has great impact on face rock-fill dam filling and construction cost.
摘要面板堆石坝堆石料的级配开采对大坝的填筑质量和施工成本影响重大。 - And the Hyperbolic tangent function curve is used to simulate the ediments wide grading curve of the mountainous river.
针对山区河流泥沙级配宽的特点，利用双曲正切函数曲线来模拟山区河流泥沙的宽级配曲线。
