They ought to provide stable reference points that everyone – no matter what their politics – can agree on.

它们应该提供稳定的参考点，让所有人——无论他们的政治立场是什么——都能达成一致。

Let's go back to some of those core concepts, the stable reference points around which we've been organizing and orchestrating our understanding of world history for hundreds of years.

让我们回到其中一些核心概念，这些是我们数百年来一直围绕着它们组织和协调我们对世界历史的理解的稳定参考点。