引導； 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. 四元數(shù)一實數(shù)和一矢量的和的表達式，有四個項，一個為實數(shù)項，另外三個為虛數(shù)項
Request radar vectoring for an ILS approach. 請求雷達引導盲降進近。
