Then there are always things that

另外还有其他的一些原因
we might call much less rational than that.

我们称之为非理性决定
In any group of people there is a small minority,

任何一个人类群体总有一小撮人
I want to emphasize small,

我说是很少的一部分人
who just love to do risky things.

他们很喜欢投机冒险
They just love adventure; they're never happy if they're safe,

他们是天生的冒险家他们乐此不疲
and so off they go seeking adventure

所以他们离开城市
and seeking to make a fortune however they're going to do it,

通过各种手段搜寻财富
so I think that has to be counted into the picture too,

这也是原因之一
so typically I think it would have been a small part of what's going on.

所以我们至少能了解其中的一部分
So, for these reasons

那么综上所述
and probably for hundred more that I haven't thought of,

当然还有很多因素我们没有涉及到