The old civilization was fast falling into decay.

旧文化很快地衰落下去。

《新英汉大辞典》

The old civilization may fall into decay.

古代的文化可能衰落。

youdao

Few peoples in the world can boast (of) such an old civilization as ours.

世界上没有几个民族有像我国民族这样悠久的文化。

youdao

They throw heraldry, they throw every kind of vestige of Old World culture and monarchy and aristocracy and civilization.

他们抛掉了世代相传的家徽,抛掉一切来自旧文明,和旧君主政体的痕迹,抛掉了贵族政治和文明

耶鲁公开课 - 美国内战与重建课程节选

You don't need me to tell you that human civilization is very, very old.

人类的文明是非常非常古老的,这不用我来告诉大家了吧。

耶鲁公开课 - 旧约导论课程节选

Understanding that the desire for change is as old as civilization should help keep things in perspective.

FORBES: New Rules for Radicals, #1 -- "The Cause"

The tide of newness and civilization encroaches upon the ancient and sacred, and old ways fall prey to the inevitability of progress.

FORBES: Connect

No global blackouts, no old Soviet ICBMs racing over the North Pole, no collapse of civilization as we know it.

FORBES: Malone's musings