路程就是个大圆，我的意思是，这个圆的半径是球的半径。

So, that's actually a great circle meridian of length, well, I mean, well, the radius is the radius of the sphere.

youdao

路程就是个大圆，我的意思是，这个圆的半径是球的半径。

So, that's actually a great circle meridian of length, well, I mean, well, the radius is the radius of the sphere.

youdao