grading curve的用法和樣例：
例句
- 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。 - 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。
