get down to brass tacks 谈重要的事；谈实质的问题；讨论基本事实；探讨实质问题

【例句】
It’s time George stopped all this theorizing and got down to brass tack. What we want to know is how much the job will cost, not how scientific the method is going to be.
该是乔治停止长篇大论而谈实质问题的时候了。我们想知道的是这项工作要花多少钱，而不是采用的方法有多科学。

Never mind the side issues, let's get down to brass tacks and thrash out a basic agreement.
别管枝节问题，让我们讨论问题的实质，以求得基本一致。