An analytical trial function method (ATF) was developed based on the quadrilateral area coordinate system (QAC-II) for plane elements (ACATF).

在四边形面积坐标QAC - II的基础上，建立了弹性力学平面问题的面积坐标解析试函数方法。

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Analogy, through the system, travel to Nanjing, people can be set to a specific area of the hotel, "first selected a coordinate, and then draw a region, in this inside look for a suitable hotel."

打个比方，通过这套系统，出差到南京的人也可以订到某个特定区域内的酒店，“先选中一个坐标，然后画一个区域，在这里面找合适的酒店。”

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A modified segmental quadratic interpolation method which describes the shape of optical system pupil with relative coordinate error less than 1% and area error about 0.25%, is presented.

本文提出了一种改进的分段二次插值法描写光学系统的光瞳形状，得到了满意的效果，其坐标误差小于1%，面积误差约0.25%。

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