For example, the US first class mail is a flat-rate service,

来源: 3271963 于 2007-07-04 06:32:13 [档案] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (192 bytes)

No matter where your mail is sent to (whether it is your local town or a place thousands miles away), no matter how many days it takes to deliver, the stamp is 41 cents for a one-ounce letter.

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