We're going to learn the tricks of additions and subtractions in this class.
2
本文给出了较简便的运算方法，该方法具有一般性，能解决一类球对称中心力场的许多问题。
In this paper, a simple method of calculation is given, the method is common and can solve some questions of central force field of spherical symmetry.
3
霍尔哲算法物理概念清楚，运算简便。
Holzer algorithm has clear physical concept and simple operation.
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