That intersection of sets, I think, needs to be a million people or something like that.

我认为，集合的交集需要有一百万人或类似的人数。

And it's where you have an intersection of sets of people who want to go, because I think only a small percentage of humanity will want to go, and can afford to go or get sponsorship in some manner.

那里有一群想去的人，因为我认为只有一小部分人想去，并且有能力去或以某种方式获得赞助。