说明：  用于测量与地图制图的高斯投影转换，提供了北京54、全国80、WGS84三个坐标系下的正算、反算。输出结果精确到小数点后7位。
(for measuring and mapping the Gauss projection conversion, the Beijing 54, 80, three WGS84 coordinates the count is, anti-counting. Output accurate to seven decimal places.)