Both are "forever" stamps, which can be used at any time in the future for first-class letter postage.
这两套都是永久邮票，可以在未来的任何时间供头等信使用。
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。
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。
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。
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