Some letters come back unopened, with a black stamp.

有些信被原封不动的退了回来，盖了个黑印戳。

youdao

In very tiny letters, the stamp said, "When you can read this, come back and see me."

原来上面的小字是写着：“当你能看到上面的字时，回来找我做检查。”

youdao

I cut this stamp with a knife carefully, and then cleaned its back with water.

我小心翼翼地割下邮票，然后用水清洁邮票背面。

youdao

It would make me feel better to go back a century and bring back stamp duty for online media.

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However, to date Sinn Fein refuses to sit on the policing board, thus holding back a stamp of approval that would be the signal to young Catholics that it would be acceptable to serve in the police.

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Before then I could have written what I knew about it on the back of a postage stamp.

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