1. Of or relating to the vertex of the head. 
   头颅顶的属于头顶的或与其相关的
2. The figure formed by a cone, bound or regarded as bound by its vertex and a plane section taken anywhere above or below the vertex. 
   圆锥体由或被认为是由其顶点确定的锥体和取自顶点以上或以下的横切平面组成的几何体
3. Situated at the vertex or highest point; directly overhead. 
   顶点的在顶点或者最高点的；头的正上方的
4. a polyhedron having a polygonal base and triangular sides with a common vertex. 
   有一个多边形底面和有一个共同顶点的三角形侧面的多面体。
5. The origin in a polar coordinate system; the vertex of a polar angle. 
   极点一个极坐标系中的始端；一个极角的顶点

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• 1. 顶点条件
  顶角 vertex angle...顶点条件 vertex condition...一束的顶 vertex of a bundle
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