So when we extend our assistance to those countries that are still developing, we have a unique perspective that says we know what you are going through, we have been there before too."

VOA: standard.2009.11.05

So, when the value of the average valence electron energy lies between 11 eV and 13 eV, we have these elements that are neither fish nor fowl, and you'll see in a little bit their unique electrical properties.

所以，当平均价电子能,在11eV到13eV之间时，这些元素介于金属和非金属之间，你们将进一步,看到它们独特的电性质。

麻省理工公开课 - 固态化学导论课程节选