当您在一个服务中对所有可变点分组时，可以考虑某种参数化的服务方法。
When you're grouping all variation points in one service, consider a parameterized service approach.
Point类的可变性使得每一个接受Point作为参数或者要返回一个Point的方法背上了编写文档说明的沉重负担。
The mutability of the Point class creates a documentation burden for every method that accepts a Point parameter or returns a Point.
一种是“可变参数内插法”，另一种是用契比雪夫多项式对卫星直角坐标进行高阶内插的方法。
One of them is "the interpolation of variable parameters" and the other is the higher order interpolation of rectangular coordinates of satellites by means of Chebyshev polynomial.
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