直角坐标方程与极坐标方程的互化是学习解析几何易出错的地方之一。
Right Angle coordinate equation and polar coordinates equation mutually melt is one of places easy to make mistakes in studying Analytic geometry.
建立了斜齿圆柱齿轮侧面及齿根面的直角坐标方程序，应用矢量法确定盘形铣刀齿刃与轮齿侧面及齿根面接触线上各点的参数值。
Parametric values on the contact lines of disc cutter blade and the side surface cogwheel, disc cutter blade and gear root surface are determined by using vector method.
假设我的生命用一个建立在四维直角坐标系里的方程来表示的话。
If my life were expressed as a function in a four-dimensional Cartesian coordinate system.
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