四大文明古国是指世界上最先由原始社会进入奴隶社会的古代埃及、巴比伦、印度和中国，它们是世界文明的摇篮。

They refer to ancient Egypt, Babylon, India and China, which were considered as the earliest entry from primitive society into slave society. They were the cradles of civilizations of the world.

youdao

四大文明古国是指世界上最先由原始社会进入奴隶社会的古代埃及、巴比伦、印度和中国，它们是世界文明的摇篮。

They refer to ancient Egypt, Babylon, India and China, which were considered as the earliest entry from primitive society into slave society. They were the cradles of civilizations of the world.

youdao