China is one of the four ancient civilizations.

中国是世界上四大文明古国之一。

youdao

China a is one of the four ancient civilizations.

中国是世界上四大文明古国之一。

youdao

China a is one of the four ancient civilizations.

中国是四大文明古国之一。

youdao

China a is one of the four ancient civilizations.

中国是四大文明古国之一。

youdao