You wouldn't buy this bond at par because at par, meaning at $100- because then you wouldn't get any interest on it.

你不是以平价买入,平价买入,意思是以100面值买,否则就没有利息收益了

耶鲁公开课 - 金融市场课程节选

You work for XYZ Corporation; the share is trading at $10 a share; they would give you "At the money" Or "Out of the money" Options -say options to buy the stock at $11 a share.

你在XYZ公司工作,当前股票价格是每股十美元,他们会给你,平价期权或者价外期权,比如以每股十一美元来购买该股票的期权

耶鲁公开课 - 金融市场课程节选