Yale University is a non-profit corporation; the price of a share in Yale University is undefined-- it's zero over zero.

耶鲁大学可以看作是个非盈利组织,它的股价无法定义,是零除以零

耶鲁公开课 - 金融市场课程节选

but it's not invisible if we mean definition No. 2 can't be sensed. Can't be observed.

但如果取第二个定义它就不再无形2,无法感知，不能观察。

耶鲁公开课 - 死亡课程节选

Although, I said, insurance was effectively discovered or invented in the 1600s, it has been slow to grow because they didn't have the well-defined-- all of the inventions yet.

尽管我说过，保险实际上,是在17世纪的时候被发现或者发明的，但它的发展非常缓慢,因为人们无法确切定义-,这种被发明出的东西。

耶鲁公开课 - 金融市场课程节选

It recognizes that the risks that a bank faces are very complex and that they are not summarized by just the classes of borrowers that were defined in Basel I.

它指出一个银行所面对的风险是非常复杂的,第一次巴塞尔协议定义的借款人风险等级,无法概括全部的风险

耶鲁公开课 - 金融市场课程节选