The South as an idea, the South and its distinctiveness was very much there even in the Colonial Period.

南方作为一个概念,指南方地区以及其特点,早在殖民时期就已经存在

耶鲁公开课 - 美国内战与重建课程节选

So even if we strip an atom of all of its electrons, we still have that same amount of positive charge in the nucleus.

所以即使把一个原子的所有电子都拿走,原子核还是带那么多的正电。

麻省理工公开课 - 化学原理课程节选