挂历原是“讨债本`”读者文摘 那是在古罗马时代，当时社会上有一种专门从事放债业务的人，按月去向债户收取利息，为方便起见，他们将何月何日某人该还的债和该付的息都记在一个本子上，因为这种本子是以月为单位，按日期排列，附有记事栏，其记事方法简便明了，渐渐地被其他 The calendar was originally “debt collection” Reader’s Digest It was in ancient Rome, when there was a community specializing in money lending business, on a monthly basis to collect interest on debt, for convenience, what month they will be The debt and the interest paid are also recorded in a book, because this book is arranged on a monthly basis, by date, with a memos column, the memo method is simple and clear, gradually by other