An ellipse is defined by its bounding rectangle; an arc is a portion of an ellipse defined by a starting Angle and a sweepAngle.
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。
2
Changes of sidewall sweepAngle and cowl position can influence inlet performance such as mass capture, total pressure recovery coefficient and uniformity of isolator exit flow field.