1N-UNCOUNT （尤指希腊和罗马）古代史Ancient history is the history of ancient civilizations, especially Greece and Rome. （尤指希腊和罗马）古代史
2N-UNCOUNT （发生在过去，与现在无关的）旧闻，陈年老账 If you describe something as ancient history, you mean that it happened in the past and is no longer relevant to the present. （发生在过去，与现在无关的）旧闻，陈年老账
It does not bother me now at all. It is all ancient history.