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。
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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