However, if instead of only points, we pick an entire region on this sphere, as you can see the north and south pole regions here, we obtain vortex tubes.

不过，如果我们不是单挑点，而是选择球体上一整片区域，你就能看到，我们在南北极这里获得了涡管。

What is also significant, Ms Mitra says, is that it has been able to stay safe and avoid falling into the craters that dot the Moon's little-explored south pole region.

米特拉女士说，同样重要的是，它能够保持安全，避免掉入月球鲜有探索的南极地区的陨石坑中。