曲面: hook face; curve; curved sur ...族: clan特征: characteristic; trait; featu ...线: thread; string; wire可展曲面的特征线: characteristic of a developable曲面族: family of surfaces特征线: characteristic curve; typical line特征线，特征谱: characteristic line民族特征: national feature; national trait种族特征: racial character双特征线: bicharacteristic curve特征线法: characteristic line method; characteristic method; characteristics method; method of characteristic curves; method of characteristics特征线弧系: set of arc of characteristics特征线素: characteristic line element特征线系: set of characteristics证券特征线: scl security characteristic line左伸特征线: left-running characteristic全特征线理论: full characteristic theory特征线法求解: method-of-characteristics solution共焦二次曲面族: family of confocal quadrics特性曲线特征线: characteristic curve元素光谱特征线条: raies ultimes曲面区域(特征): surface region曲面特征: surface features特征超曲面: characteristic hypersurface
