美国的新变址系统通过在邮递过程中尽早的改变邮寄方向来降低成本。
A new change-of-address system in the United States reduces costs by redirecting mail earlier in the process.
支付：我支付信用卡帐单。邮递：银行邮寄信用卡帐单。拒付：帐单有误，不被核准。
Post: the bank sends the credit card bill. Pay: I pay the credit card bill. Reject: Something is wrong on the bill, and it isn't approved.
所谓的“蜗牛邮件”就是传统的邮寄信件，没有邮递员也没有邮箱。
'Snail mail' is the traditional letter delivering service in which you have a postman and a post box.
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