So what number first are they presenting?

这是什么数字呢，代表什么呢？

哈佛公开课 - 计算机科学课程节选

In that game, if you remember what the best responses looked like, they looked like this where this was the effort of Player 1; this was the effort of Player 2.

不知道你们还记不记得最佳对策是什么了,这条线代表参与人1的付出,这条代表参与人2的付出

耶鲁公开课 - 博弈论课程节选

There's also this backslash R. Anyone know what backslash R is?

这还有\r，谁知道\r代表什么？

哈佛公开课 - 计算机科学课程节选