the cardinal number that is the sum of three and one
造句
用作名詞(n.)
The norm of a quaternion is similar to that of a vector. 四元數的平均值與矢量的有點相似。
This paper studies comparatively dual Euler method and quaternion method which are used for the solution of the singularity of the Euler equation. 對解決歐拉方程奇異性的雙歐法和四元數法進行了對比研究。