根据rdf模型的约定画法，这意味着它返回所有的椭圆和圆弧(但不返回矩形)。
According to the conventional drawing of RDF models, this means it returns all ovals and arcs (but not rectangles).
还要注意，不是使用简单的circle元素，我使用一个具有椭圆弧形的path创建了圆，所以火箭有了一个具有起点和终点的路径。
Also note that instead of the simpler circle element, I have created the circle using a path with elliptical arcs, so the rocket has a path to follow with a beginning and an end.
重点讨论了椭圆弧和样条曲线、样条曲线和样条曲线之间的模糊识别。
Have discussed the fuzzy discernment among oval arc and spline curve, spline curve and spline curve especially.
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