If you went to a store to buy something with paper money then the person at the ? would it be a cash register?

如果你用纸币去一家商店,买些东西，那么收银员,等等，那时会是个收银员吗？

耶鲁公开课 - 金融市场课程节选

So, it looks like the curry and some other items were really precisely defined in terms of price and this is of course has generated this receipt - by some computer, some cash-- cash register and they just didn't account for the inherent imprecision so here is a perhaps real world incarnation of that.

看起来咖喱,和其他一些东西都被明确地定价,这当然可以,通过计算机-,收银机生成这份收据，而且它们并不对,其内在的不精确性负责,这可能就是现实世界中的一个典型。

哈佛公开课 - 计算机科学课程节选