On the the 40th anniversary of Earth Day, this warming planet we live on is posing serious new challenges to human civilization: increasingly severe droughts, floods,and storms across the globe, and slowly rising ocean levels.
VOA: standard.2010.04.21
Nevertheless, our knowledge of the earliest stages of human civilization was quite limited for many centuries.
然而,几个世纪以来,我们对人类最早时期文明,的认知是很有限的。
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。
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