速写比绘制要快，但是怎样画线和弧是被定义好的，它能提供的特性较少。
Sketching is quicker than Drawing, but offers less specificity in how your lines and arcs are defined.
椭圆是由其边框定义的；弧是椭圆的一部分，由一个起始角和一个扫描角定义。
An ellipse is defined by its bounding rectangle; an arc is a portion of an ellipse defined by a starting Angle and a sweep Angle.
讨论了弧焊机器人焊接位姿参数的定义。
The definitions of welding pose parameters of arc welding robot were discussed.
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