exploring the lost civilizations of the world 在地球上，存在着各种各样没落的文明。其中既有神秘莫测的金字塔文明，又有消失的各种古城文明。众多的古城遗址究竟在哪里呢？一起来探索一下吧！ some of them nestle(半隐半现地处于)in the jungle on a mountain.some of them are found in the middle of a modern city.the remains of these lost civilizations are just waiting to be explored! machu picchu(马丘比丘)is the lost city of the incas(印加文明)．over the centuries，the city was covered in dense jungle，but in 1911，the explor
