In this paper we discuss the spiral structure of dish galaxies in three-dimension according to the density wave theory.
本文从密度波理论出发，讨论三维盘状星系的旋臂结构。
Based on the nonlinear equations of the theory of density wave, the evolutionary direction and the observable conditions on spiral galaxies may be derived by the qualitative analysis theory.
基于密度波理论的非线性方程，用定性分析理论可导出旋涡星系的演化方向和由观测可得到的演化条件。
In a spiral wave, the orbits are progressively misaligned, so that the region of enhanced density is a curved line.
在螺旋波里，轨道则是逐渐弯曲，所以密度变大的区域是曲线状。
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