And it turns out the second solution, with negative energy, was when the theory is telling you, hey, there are particles and there are anti-particles, and the negative energy when properly interpreted will describe anti-particles.

结果,后来证明,第二个根,也就是能量为负的那个根,正是理论的关键,世界上既有粒子,也有反粒子,负能量就是用来解释反粒子的

耶鲁公开课 - 基础物理课程节选

It doesn't mean anything until you know how many shares are outstanding because if I own one thousand shares and then you look it up and find out how many shares are outstanding-- there are one thousand-- you say, hey I own the whole company.

这毫无意义,除非你知道总共发行的股票数量,如果你有十手股票,但后来发现,总共发行的股票数量,就是一千股,你就可以说,整个公司都是我的

耶鲁公开课 - 金融市场课程节选