envelopvt.包封;遮盖;包围
enveloping curvature包络曲率
enveloping semigroup包络半群
enveloping worm drive环面蜗杆传动
enveloping worm helix环面蜗杆螺旋线
enveloping worm wheel包络蜗轮
envelop characteristic包络特征
envelop delay distortion包线延迟畸变
enveloping curve formula暴雨洪水
enveloping active carbon包膜活性炭
enveloping worm gear pair环面蜗轮副