It consists of a promise to pay, usually denominated in currency, and there are both long-term and short-term debt instruments.

是一种付款承诺,通常是货币支付形式,有长期债券,以及短期债券

耶鲁公开课 - 金融市场课程节选

There are not only debt instruments that are payable in currency, but there are also indexed debt instruments that are indexed to the price level so that they give real interest rates.

债券工具,不仅仅是可以支付的货币手段,还是指数利率工具,以指数的形式表达债券的价格水平,显示出实际利率

耶鲁公开课 - 金融市场课程节选

Debt is the simplest of financial instruments.

债券是金融工具中最为简单的一种

耶鲁公开课 - 金融市场课程节选