Four ancient civilizations 四大文明古国
four great ancient civilizations 四大古文明 ; 文明古国 ; 世界四大文明 ; 世界四大文明古国
Silk, as one of the earliest inventions in Chinese history, like Chinese four great inventions of ancient civilizations, have impacted the world widely.
丝绸，中国历史上最早的发明之一，与中国古代文明中的四大发明一样，都产生过世界性影响。
On the above basis, this means only four or five civilizations in the galaxy at any time.
根据上述论据，说明星系在任何时候都只有四、五个文明社会存在。
Human civilizations are all originated along big rivers, for example, the four ancient civilizations of the world.
人类的文明，最早均起始于大江大河之畔，世界四大古代文明都发源于一些著名的河流两岸。
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