说明：  用来计算地球表面两点之间的距离，该程序通过输入两点的经纬度坐标确定两点的距离，可用于各种工程应用当中
(The Earth s surface used to calculate the distance between two points, two points in the program by entering the latitude and longitude coordinates to determine the distance between two points can be used in a variety of engineering applications which)