长方形和多边形是由若干条线条组成的，并且椭圆是由若干条圆弧组成。

Rectangles and polygons are composed of multiple lines, and ellipses are composed of multiple arcs.

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对多边形、椭圆和圆能够进行填充。

Of polygons, ellipses and circles to be filled.

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椭圆形截面可以比圆形、方形和多边形截面更有效地折减流体对椭圆形钢管混凝土所作用的荷载。

Compared with the cross-section shape of circle, square, polygon, elliptical section can be more effective in reduction of the load that the fluid ACTS on it.

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