我们还会听到一些天文学的名词：如黄赤交角和小行星动力学等等。
We hear about astronomy too: the obliquity of the ecliptic and the dynamics of asteroids.
为了建立高速水稻插秧机椭圆齿轮行星系分插机构的动力学模型，必须分析推秧装置对该机构的作用。
In order to set up the dynamics model of the transplanting mechanism with planetary elliptic gears of high-speed rice transplanter, the effect of seedling-pushing device on it must be analyzed.
行星地球自转动力学主要有两方面研究内容：自转变化和在自转条件下内部流体物质运动。
There are two main research fields in the rotation dynamics of the planet Earth: rotation variation and the fluid motion effected by rotation.
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