the cardinal number that is the sum of three and one
例句
用作名词(n.)
The norm of a quaternion is similar to that of a vector.四元数的平均值与矢量的有点相似。
This paper studies comparatively dual Euler method and quaternion method which are used for the solution of the singularity of the Euler equation.对解决欧拉方程奇异性的双欧法和四元数法进行了对比研究。
