The curator says, Steven Spielberg is interested in what she calls "the moral core" that can be seen in many of Rockwell's images.

VOA: standard.2010.08.09

He has the most varied career and has been celebrated in so many different situations that we're honored that he's here on the Inner Core today.

他的职业生涯很丰富,可谓功成名就,我们很荣幸今天能请到他来到现场。

普林斯顿公开课 - 人性课程节选

So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.

那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。

麻省理工公开课 - 化学原理课程节选