If you describe something such as a fact or remark as irrelevant, you mean that it is not connected with what you are discussing or dealing with.
beside the point , unrelated , unimportant
irrelevant details.
一些不相关的细节。
The government decided that their testimony would be irrelevant to the case.
政府认定他们的证词与该案件不相关。
If you say that something is irrelevant, you mean that it is not important in a situation.
The choice of subject matter is irrelevant.
主题的选择不重要。