It was a short way of writing a different spelling of the words all correct. Some foreign-born people wrote all correct as o-l-l k-o-r-r-e-c-t, and used the letters O.K.

VOA: special.2010.02.28

The U.K. Had copied the U.S. Idea -I guess they copied -I don't know where the original -I think it's probably -is it U.K. Cpying the U.S. In this case?

英国效仿了美国的想法,我猜他们是效仿美国的,我也不知道谁先发明的,我认为可能是,存款保险是英国模仿美国

耶鲁公开课 - 金融市场课程节选

The classic experiment that demonstrated anchoring was Kahneman and Tversky--I'm writing K&T -in a wheel of fortune experiment, which they did in 1974.

一个阐述锚定效应的经典实验是,卡尼曼和特维斯基...我用K&T来表示,他们在1974年做了幸运轮盘实验

耶鲁公开课 - 金融市场课程节选

Mathematically complete problem is that you can find the function x of t by saying that the second derivative of the function is equal to -k over m times the function.

这个数学问题就是,你可以求出函数 x,只要令函数的二阶导数,等于 -k 除以 m 再乘以函数

耶鲁公开课 - 基础物理课程节选