In this paper, the principles of mathematical reduction are described by using mathematical method.
采用数学方法描述化归的原理。
As a branch of geophysics, theoretical and applied researches in geothermics are made by using mathematical method and physical model experiment like other geophysical methods.
作为地球物理场的一个分支，地温场在理论和应用研究方面与其它地球物理场一样，也主要是依靠数学方法和物理模型实验的方法来进行的。
Using mathematical method to analyze the health status of workers and inhabitants of typical industrial districts and industrial neighborhood and put forward the mitigation countermeasure.
用数学方法对典型小区和大部分工业街坊的职工和居民的职业病和健康进行分析，并提出减少噪声伤害的若干对策。
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