That term was actually coined by economists, Prescott and Mehra; it's now in general use. That is, it just seems that stocks so much outperform other investments.

这个术语是由经济学家,普雷斯科特和梅拉提出,现在被广泛引用,这表明股票收益远超其他投资

耶鲁公开课 - 金融市场课程节选

The article "an" or "a", you use when you're talking about like either a general category of items or

冠词中，“an”或“a”，是当你谈论那些一般的或者可选择的条目时用的，

经常犯的失误 - SpeakingMax英语口语达人

So, it was effective, it was rapidly then introduced into general use.

因此,疫苗是有效的,它迅速得到了广泛应用

耶鲁公开课 - 生物医学工程探索课程节选

And in general, what I would say is, when in doubt, use parens. OK.

因此通常上，我会告诉大家的是，当有疑问的时候，请用括号，好。

麻省理工公开课 - 计算机科学及编程导论课程节选