单词	四点蝶
释义	同四点蝴蝶鱼--四点蝶
随便看	principal plane of photograph principal plane [of projection] principal plane of stress principal plane of symmetry principal--plane of symmetry principal planet principal planets principal point principal point error principal point of discussion principal point of photograph principal-point radial principal point triangulation principal polygonometric network principal produce principal product principal profile principal proposition principal quantum principal quantum number principal radius of curvature principal radius of gyration of area principal rafter principal ray principal reaction