Interesting, yet the two of you are living proof she has at least a working knowledge of the subject.

有意思，你们母亲至少掌握了关于这个课题的实践性知识，你们两个就是活生生的证据。

I have a working knowledge of the important things in the universe.

囧囧囧囧囧我有宇宙重要事物的相关知识。

My goal with this video is to try and summarize the facts of this tragic event in a way that is approachable by people who don't have a working knowledge of the intricacies of the power grid.

我制作此视频的目标是尝试以一种对于那些不了解电网复杂性的人来说可以理解的方式总结这一悲惨事件的事实。