intermediate point of great circle

例句：

1. 1. The distance between the two points is 10 units.
   两点之间的距离是10单位。
2. 2. The midpoint of the line divides it into two equal halves.
   这条线的中点将线分成两个相等的部分。
3. 3. The median point of a circle divides it into four equal parts.
   圆的中点将圆分成四个相等的部分。