So, the Commune begins on the 18th of March, 1871, and it lasts until the end of May, 1871. Lenin once called it the "Festival of the Oppressed"; and Lenin was wrong about many things, he was right about a few things but wrong about many, but he got that one right.

由此,巴黎公社在一八七一年三月十八日成立,并于同年的五月底被政府所瓦解,列宁将这段时间称为"受压迫者的庆典",列宁做错过不少事情,他做对的事情寥寥无几,但对于巴黎公社的评价是正确的

耶鲁公开课 - 1871年后的法国课程节选

I am going to say if that electron is to stay in its orbit, that is to say it doesn't flee the atom, it doesn't collapse under the nucleus then the sum of the forces on the electron must be zero No net force. And so that will be the sum of a dynamic force plus an electrostatic.

如果电子会保持在它的轨道上运行,既不脱离原子的话，它就不会由于原子核对它的吸引力而被瓦解掉,电子所受的合力一定为零,由于没有合力,所以电子所受力为动态力和静电力的总和。

麻省理工公开课 - 固态化学导论课程节选