The cases where transversely isotropy rotates along three axes are often studied,and the concept of circle coordinate system is presented in order to depict them generally.

• 一般研究横向各向同性介质沿三个坐标轴方向旋转得到的倾斜横向各向同性介质,为了方便统一描述这类不同旋转方向的各向异性介质,提出了循环坐标系统的概念。