The debt of a company is the amount of money it owes either to banks, or to bond holders, or to note holders, or commercial paper holders; these are fixed incomes.

公司的债务是指一笔借来的钱,不管债权人是银行还是股东,或债券所有人,或者商业票据所有人,这些都是固定收益

耶鲁公开课 - 金融市场课程节选

The reason they call them coupons is that, in the old days, you used to actually--when you bought a bond, there would be a piece of paper and the piece of paper would have attached to it a lot of little coupons that you would clip.

这里被称作"票息"的原因是,在过去,当你买了债券的时候,会有一张纸,那张纸上附带了许多,你能剪下来的小纸票

耶鲁公开课 - 金融市场课程节选