Based on gear dynamics, the formation of side-band and its mathematical description are researched in this paper.
本文从齿轮啮合动力学出发，研究了调制边频结构的形成及其数学上的描述。
Structure and dynamics of galaxies are reviewed from the point of galactic formation and evolution scenario.
从星系形成和演化的角度出发，对星系结构和动力学进行粗略的评述。
It is very important to deeply study the formation and the dynamics of spiral wave.
因此深入研究螺旋波的形成及其动力学行为具有重要的意义。
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