translation.en: The problem is, though, that I wanted to explain to you how this really works -- but I can have four of these on my finger, so you would not be able to really see them.
translation.zh: 现在我想向大家展示一下LED是如何工作的， 但是它体积太小，我的小指上都能放下四个LED， 这样你们也没办法看清楚。