| 单词 | 即顶点 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔cone〕The surface generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along a fixed curve, the directrix.锥面：由一条直线，即母线，通过一固定点，即顶点，沿一给定曲线，即准线，连续移动而产生的平面美国传统〔dextral〕Zoology Of or relating to a gastropod shell that coils clockwise and has its aperture to the right when facing the observer with the apex upward.【动物学】 右旋的：软体动物的螺形外壳上的螺线顺时针螺旋即顶点向上，面对观察者时，螺线向右旋转美国传统 |
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