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N a line joining a point in space to the origin of polar or spherical coordinates 向量径 [maths]
The radius vector of each solid is always a positive length.
每个立体的矢径总是正值长度。
Making use of the moment vector and radius vector of rotation, the lateral buckling of thin-walled members are analyzed.
以弯矩矢量和转角向径为工具，分析了薄壁构件的弯扭屈曲。
With the help of the simple mathematical method, another transformation formula of coordinates and time between the radius vector equations in inertial frames is derived in the paper.
本文运用简单的数学方法推导出惯性系矢径方程的另一种坐标和时间变换式。
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