angle preserving mapping的用法和樣例：
例句
- The method of conformal mapping is a tool to achieve this solution.
保角映射法就是一種尋求這個解的工具。 - The Geocentric angle should be avoided as possible.Two samples were given to discuss the cases when the geocentric angle must be used, as well as the results and error analyses.
討論了需要利用地心角映射關係進行計算時的兩種情況，同時給出計算結果和誤差分析。
