With Cairo there is also a notion of a brush tip expressed through the stroke width.
在cairo中，也有画笔形状的概念，这由笔画宽度来表达。
A line (with pen width 10) and an ellipse are filled with the linear gradient brush.
直线(画笔宽度为10)和矩形会使用线形渐层笔刷填满。
A through hole is arranged on the surface of the hood. The width of the through hole is larger than the maximum width of a blackboard brush.
在防护罩表面开口透孔，且透孔宽度大于粉笔擦最大宽度。
A through hole is arranged on the surface of the hood. The width of the through hole is larger than the maximum width of a blackboard brush.
在防护罩表面开口透孔，且透孔宽度大于粉笔擦最大宽度。
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