引导； 定向； 定航向
An expression that is the sum of a real number and a vector and that contains four terms, one real and three imaginary. 四元数一实数和一矢量的和的表达式，有四个项，一个为实数项，另外三个为虚数项
Request radar vectoring for an ILS approach. 请求雷达引导盲降进近。
