grading collocation的用法和樣例：
例句
- Grading exploitation of rock-filling materials has great impact on face rock-fill dam filling and construction cost.
摘要面板堆石壩堆石料的級配開採對大壩的填築質量和施工成本影響重大。 - And the Hyperbolic tangent function curve is used to simulate the ediments wide grading curve of the mountainous river.
針對山區河流泥沙級配寬的特點，利用雙曲正切函數曲線來模擬山區河流泥沙的寬級配曲線。
