1. Because one vertex can only have one normal, you must duplicate the vertices as well. 由于一个顶点只能有一条法线，所以你还要复制顶点。
2. In the first feasible region above, the optimal solution is the right vertex of the solution space. 在上面的第一个可行域中，优化解决方案是解析空间中的右顶点。
3. If the horizontal line drawn is aligned with a polygon vertex, then only the segments that are below the line are counted. 如果所绘制的水平线与一个多边形顶点对齐，那么只计算位于该线下方的部分。
4. In prognathous insects, the vertex is not found between the compound eyes. 下巴突出的昆虫的复眼之间没有顶点。
5. A vertex tree is built to represent the data structure of the models by octonary subdivision. 以八叉剖分来建立一棵顶点树，用以表示整个网格模型的数据结构。
