A backscatter model was developed for measuring wind field with far-field approximation method.
提出了一种基于远场近似法建立的大气风场测量散射模型。
Very accurate predictions of planetary orbits require corrections to the central-field approximation.
想要非常准确地预言行星的轨道，就需要对中心场近似进行修正。
Under the mean-field approximation, the free-energy functional of binary mixtures of star-like polymers is derived.
在平均场近似下求得了星型高分子共混体系的混合自由能及其相分离动力学方程。
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