... Error initialize=初始化错误 No drawing defined=没有图形定义 Cannot create parser=无法创建解析器 ...
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It takes up space as defined by the border attributes but does no drawing.
它占用了由border属性指定的空间，但是并没有描绘出来。
The connected matrix of topological relationships between vertices was renewed by occlusion matrix, and the projection drawing defined by connected matrix had no hidden line.
利用遮挡矩阵更新表示顶点间拓扑关系的连接矩阵，得到不含隐藏线的投影图。
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