你说的与本题无关。

What you said is irrelevant to the subject.

那个问题与本题无关，没有必要回答。

That question was beside the mark and need not be answered.

你所说的也许是对的, 但是与本题无关.

What you said may be right, but it is beside the question.

我曾读过一本书，叫《野性的呼唤》，不过这与本题无关。

I once read a book call the call of the wild, but that 's beside the question.