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.
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。
The arc has a sweep Angle of -180 degrees, which is counterclockwise in the default coordinate system.
这个弧形的散出角度为- 180度，也就是预设座标系统的逆时针方向。
It Is composed of drive equipment, sweep down mixing impeller, arc surface, flow guiding device and slot body.
由传动装置、下掠式搅拌叶轮、弧形复曲面、导流装置、槽体部件组成。
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