"And so he then went back and worked on technology adaptation and designed very low-cost, small affordable solar panels with fitted bulbs, maybe one or two bulbs per household, made sure that the bulbs could be moved from room to room, depending where people wanted the light,".

VOA: standard.2009.12.18

They did this because they didn't want the upper-class in Rome, who were the elite, they didn't want any one household, or any small group of households, to become too powerful.

因为他们不想罗马的上层阶级，即精英阶层，一户独大。

耶鲁公开课 - 新约课程节选