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地球表面两点间的最短距离不是连接两点的直线距离,而是经过这两点所在的以地心为圆心的大圆的劣弧(不超过半圆弧)长度。
The shortest distance between two points on the surface of the Earth is not the straight line distance connecting two points, but the length of the minor arc (not more than a semicircular arc) of the great circle centered on the center of the earth where these two points lie.