bills of exchange, also referred to as bills, are essentially a short term credit instrument that can be used by a company either for financing or investment. bills can be issued for any term up to a year and are generally issued for periods of less than 6 months. companies issue bills because they are a convenient form of borrowing. the difference between bills and a standard loan is that bills held by the bank can sold to investors. bills with terms of 30 days to 90 days are the easiest to trade? bills are usually an ideal loan because a company generally will not run into any problems within 3 to 6 months. 汇票，也叫票据，主要指一种可用作公司筹资或投资的短期信用票据。汇票的使用期限可以是一年以内的任何期限，但通常在六个月以内。公司签发汇票是因为它们是借款的捷径之一。汇票与正常贷款之间的差异在于银行可将持有的汇票卖给投资者。期限为30到90天的汇票最容易出手。汇票通常是最理想的贷款，因为公司一般在3到6个月的时间内出问题的几率很低。