Ancient history
01
古代史, 古代世界的历史
a history of the ancient world
02
古代历史, 旧闻
knowledge of some recent fact or event that has become so commonly known that it has lost its original pertinence
03
古代历史, 遥远的过去
something that occurred a long time ago and is now considered irrelevant or unimportant
Informal
例子
That argument we had is ancient history, so let's not bring it up again.
我们之前的那场争论已经是陈年旧事了，所以别再提了。
His past mistakes are ancient history now that he ’s completely changed his ways.
他过去的错误现在已经是古代历史了，因为他已经完全改变了他的方式。
