说明：   VTK 编程简介, VTK数据类型,可视化管线,可视化管线的执行单元和点集VTK, 数据集的类型和数据集的属性数据
(Introduction to Programming VTK, VTK data types, visualization pipeline, visualization pipeline execution units and point set VTK, the type of data sets and data sets of attribute data)