本文从密度波理论出发，讨论三维盘状星系的旋臂结构。
In this paper we discuss the spiral structure of dish galaxies in three-dimension according to the density wave theory.
其特点包括刚体在静态结构建模和三维概率密度的结果用两种不同的算法。
Features include rigid body modelling to result in static structures and three-dimensional probability densities using two different algorithms.
二是反演地球内部结构，主要是三维密度的不均匀分布，并对诸如地慢对流等作约束；
The second application lies in the earth's interior structure. The gravity fields can provide constraints for three-…
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