Unfortunately, there is also a hell on earth.

遗憾地是，世上也有人间地狱（a hell on earth）。

A war zone or a place destroyed by a natural disaster can become a " hell on earth."

一个战争地带或者一个被自然灾害毁灭的地方会是一个“人间地狱”。

A " hell on earth" is a place or situation where things are so bad you feel as if you are in, well, hell.

“人间地狱”指的是你身处于一个非常糟糕的地方或者一个境地，好吧，让你感觉你在地狱。