The authors want to deduce a brief formulation, and use all-purpose program to get exact result for echelon, rectangle and rotundity cross section.

作者想推导简短的公式，对梯形、矩形和圆形断面采用通用的程序，以得到准确的结果。

This is an all-purpose tractor.

这是辆万能拖拉机。

We have made [technology] an all-purpose agent of change.

我们已经把技术作为了一种改变的万能中介。

Is that they make great general all-purpose mayfly attractor patterns.

他们一般是大全能蜉蝣吸引花纹。

It is important to understand that KParts isn't an all-purpose object model.

理解KParts不是一个万能的对象模型很重要。