simply connected Riemann surface单连通黎曼面
multiply connected surface多重连通面
Simply Connected Surface Coordinates单连通曲面坐标系
doubly connected surface[数] 双连通面
simply-connected surface单连通面
simply connected surface单连通曲面
Multiple Connected Surface Coordinates复连通曲面坐标系
Surface Connected Cracking焊缝表面开裂