And then there's the rural underpopulated frontiers that are still largely devoid and empty of any of us.

然后是人口稀少的农村边疆地区，那里在很大程度上仍然鲜少有我们任何人。

A final reason the trades are underpopulated, up until recently, some two-thirds of Americans were excluded, women, people of color, or both.

技工人丁稀少的最后一个原因是，直到今天，有约三分之二的美国人被这一行业排除在外，其中包括妇女、有色人种或者两者都有。

As discussed previously, Mexico's borders in the South with Guatemala and Belize are underpopulated and covered by thick rainforests and jungles with only eight paved roads across them.

如前所述，墨西哥南部与危地马拉和伯利兹接壤的边境地区人口稀少，被茂密的雨林和丛林覆盖，只有八条铺设好的公路横穿这些地区。