Of course, with cities we typically find a whole association of cultural characteristics, which we deem civilization.

当然,我们总能从城市中找到一系列,独具代表性的文化特征,我们将其界定义为文明

耶鲁公开课 - 古希腊历史简介课程节选

And let me use a big Q to be the total quantity produced-- sorry--the total quantity demanded in the market.

用Q代表总产量,对不起,是市场总需求量

耶鲁公开课 - 博弈论课程节选