One day, while I was working in my laboratory, Jules Simon knocked at my door.

VOA: special.2009.07.18

They don't come door to door anymore unless they're working for the Jehovah's Witnesses.

现在他们不怎么上门推销了,除了为耶和华见证会工作

耶鲁公开课 - 美国内战与重建课程节选