It was a very basic reaction to find some reason we can do this.

这是为了找点理由来笑的 一个非常基本的反应。

Despite being such a basic reaction, experts still aren't sure exactly why tickling makes us laugh, but they do have a few ideas.

尽管是一种基本的反应，但专家仍然不确定为什么挠痒会使我们发笑，但他们已经有了一些想法。

My basic reaction as a historian is: If this is the era of post-truth, when the hell was the era of truth?

作为历史学家， 我的基本反应是：如果这是后真相时代， 那见鬼的什么时候才是真相时代？