最后，对接触流动函数及参变量的意义作了详细说明。
Finally, the flow functions and parametric variables of contact element are discussed.
但如果我们使用角度作为参变量的话，我们可以得到最简单的答案。
But, I think here, we will get the simplest answer if we parameterize things by the Angle.
本文给出了平面与空间接触问题的带参变量的变分极值原理。
The parametric extremum variational principles are deduced for the plane and three dimensional elastic contact problems.
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