普通定义的积分是定义在一段线段上的，而线积分则用更一般的路径，像抛物线或圆。

An ordinary definite integral is defined over a line segment, whereas a line integral may use a more general path, such as a parabola or a circle.

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任一连续曲线可以借一系列很小的抛物线线段较精密地近似表示。

Any continuous curve can be closely approximated by a series of small parabolic segments.

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在一些实施例中，侧壁由一系列近似为抛物线区段的内连接线段限定。

In some embodiments, the sidewalls are defined by a series of inner-connected lines segments approximating a parabolic section.

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