邮局官员估计这项涨价将使每个家庭一年邮费平均增加三元，但已预先购买的永久邮票(Forever stamps)，则不受影响。 这是连续第三年邮资在5月份上涨，根据新的制
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As the name implies, "forever stamps" will keep their first-class mailing value forever, even when the postage rate goes up.
如名字暗示，“永远地 捺 印”将会永远地保存他们的最好邮寄价值，即使当邮资率上升。
Postal Service stamp - one of the so-called "forever stamps" that will be good for first-class postage no matter how high rates go in the future.
这种邮票是“永久邮票”之一，也就是无论将来利率多高，它都会被用作头等邮资。
The first forever stamps are selling for 41 cents apiece, but they won't have a price printed on them and they will remain valid for sending a letter regardless of any future increases.
首次发行的永久邮票为41美分每张，但是却没有面额，无论以后怎么涨价，都可以用来寄一封信。
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