21. 片状图 22. 视角的调整 23. 向量场的绘制 24. 灯光定位 25. 柱状图 26. 设置照明方式 27. 羽状图 28. 立体透视（1） 29. 立体透视（2） 30. 表面图形 -21. Flaky Figure 22. Angle adjustment of 23. Vector field drawing 24. Lighting position 25. Histogram 26. Install a lighting means

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