First create a new layer and with a small soft brush, just draw in some wavy lines like shown.
首先新建一个图层，用柔软的画笔画几笔如下图的曲线。
When drawing with Cairo, the simplest operations are akin to choosing your medium, selecting a brush, choosing a color, thinking about the line placement, then actually drawing the lines.
在用cairo进行绘图时，最简单的操作就像手工绘画时一样：选择绘图介质，选择画笔，选择颜色，考虑线条的布局，然后进行实际绘制。
Brush + Vacuum cleaning method, no consumable material, no need to interrupt lines.
毛刷真空清洁方式，无耗材，生产中无需停线。
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