熵约束矢量量化 ECVQ

束矢难折 there is strength in unity

束缚矢量 bound vector

弧矢光束 sagittal beam ; segittal ray

极矢量约束 Pole Vector ; Pole vector constrain

弧矢光束、纬线 segittal ray

矢量约束 Pole Vector

跨界切矢约束 restriction of tangent vector across border