Today caves remain the least explored places on Earth. 今天 洞穴仍是地球上 人类最少涉足的地方
one of the lowest hottest places on Earth. 地球上一处最低最热的地方
But even so, there are still places barely touched by humanity. 尽管如此 地球上仍有一些 人类极少涉足的地方