对每个候选变化点，经过一次判断即可确定多项式的合适阶次。
At each candidate change point, a reasonable order of the polynomial function can be determined by once estimating.
在求解域上，利用迦辽金法，将泊松方程的非齐次部分用一个5阶多项式近似表示，而这些多项式对应的方程特解可以很容易获得。
In the solution domain, thePoisson equation is approximated with the 5-order polynomial using Galerkin method, and the particular solution of the polynomial can be determined easily.
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