By next year , u.s. bulk mailers also will have to start using intelligent bar codes -- with 31 instead of 11 digits of data , allowing for refined tracking and earlier identification of undeliverable addresses .

到明年年底，大量的美国邮递员也得开始使用智能邮政编码用31位代替11位的数据，它能够精确的确定地址，并尽早发现无法投递的地址。