The message I'm trying to get to here, because I'm running you right up against time, is I have to be careful about what's a primitive step.

我想说的事情是，因为我正在跟大家讲算法时间复杂度，我们需要注意一个基本步骤的定义,如果我可以假设。

麻省理工公开课 - 计算机科学及编程导论课程节选

When they created margin rules that the seller had to be borrowing against securities. Just made more money when securities went up more value.

当我们发明保证金制度,卖空证券时需要交担保金,证券升值时能赚到更多钱。

斯坦福公开课 - 经济学课程节选