bill bond note都是指债券
在美国有不同期限的债券
短期用BILL
中期用bond
长期用note

太感谢了

1、 Bond是债券，比如一个国家或者公司所发的债券。英语解释：Bond is a written instrument that bears an obligation, especially one that requires payment of an agreed amount of money on or before a specified future date.  
2、Bill的解释也很多，相比Bond和Note就广义多了。Bill 可以是一张纸币（a legal paper money such as a one-dollar bill）；可以是一纸运输的提货单（a Bill of Lading)；可以是一份请愿书（a Bill of Petition); 可以是一纸账单（a credit cardly bill，a gas bill)；也可以是一个法律提案（an Abortion Bill presented for approval to the U.S. Congress)。
3、 Note在词典里的解释不少。在金融经济学中，Note is a written instrument that bears a promise to pay a certain sum at a specified future date or on demand。This instrument is called a promissory note.Banknote是一个国家的中央银行（the central bank）所印发的钞票。在美国统一商法典（the Uniform Commercial Code, or U.C.C.)的第三篇(Article 3)里，a Note or a Check is a special form of contract unconditionally calling for the payment of money on demand or at a definite time or after the occurrence of some future event.