You have closed end funds, trade as a security listed on the stock exchange, but what they do is own other securities.

假如你持有封闭式基金，这种基金在证券交易所作为一种债券进行交易，但是实际上它们做的是持有其他债券。

耶鲁公开课 - 金融市场课程节选

If at the end of the semester you take a three-hour exam in a closed environment and you answer everything, I don't care what you did in your homework or your Midterm.

如果在学期末的时候,你能在独立地完成3小时的考试,答出所有题目,那我就不会计较平时作业和期中测试了

耶鲁公开课 - 基础物理课程节选