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。
Taught in a group setting, these courses cover the basics of tree hazard assessment, line placement, ascending, descending and moving around in the canopy.
这门课程为团体教学，包含树木危险性评估、绳索放置、上升、下移、树木自由移动的基本知识。
Taught in a group setting, these courses cover the basics of tree hazard assessment, line placement, ascending, descending and moving around in the canopy.
这门课程为团体教学，包含树木危险性评估、绳索放置、上升、下移、树木自由移动的基本知识。
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