离题万里 be remote from the subject
completely off the point
- 他曾在联合国大会等场合的演讲上胡说八道、离题万里。
He gives rambling incoherent speeches at places like the United Nations. - 不要因为讲了几个笑话或例证导致离题万里,而把根本目标抛到了脑后。
Do not get so carried away with jokes or illustrations that you forget the basic purpose. - 这本书把真正的侦探工作与最为荒谬的非理性推理和离题万里的文学批评混杂到了一块儿。
The book blends genuine detective-work with the most absurd non-sequiturs and red herrings of literary criticism.