运用数学方法推导得到精确的孔型参数。
By use of inference of mathematical method, the accurate pass parameters are obtained.
有时候，我甚至运用数学方法和模型去购物。
Sometimes, I even use mathematical methods and models to go shopping.
运用数学方法是社会科学研究的一种现实趋势。
The application of mathematical method is a kind of realistic tendency in the study of social science.
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