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。
I'm supposed to mail that letter but where the heck are my stamps?
我本应该把那封信邮寄出去可邮票到底哪儿去了呢？
This is the most obvious piece of organizing advice in the world — until you've got a letter to mail and can't find the stamps.
这是世界上对整理工作而言，最平淡无奇的建议——直到你需要邮寄一封信却找不到邮票的时候。
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