1. A line that joins a vertex of a triangle to the midpoint of the opposite side. 
   中线从三角形顶点到对边中点的直线
2. the perpendicular distance from the base of a geometric figure to opposite vertex (or side if parallel). 
   从几何基准面到顶端的垂直距离。
3. The perpendicular distance from the base of a geometric figure to the opposite vertex, parallel side, or parallel surface. 
   顶垂线，高线从一个几何形体的底边到相对的顶点、平行边或平行面的垂直距离
4. Of or relating to the vertex of the head. 
   头颅顶的属于头顶的或与其相关的
5. 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

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• 1. 对顶
  opposite vector 反向向量...opposite vertex 对顶...opposition 对立
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• 2. 相对顶点
  opposite sign 反号...opposite vertex 相对顶点...作者：iround
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• 3. 对顶点
  异号；反号 opposite sign...对顶点 opposite vertex...反向的 oppositely directed
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• 4. 對頂
  opposite to 與…相反...opposite vertex 對頂...opposite 相對的
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