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paper patch attached to something; paper backing; sticker; label
notice; poster
落し物の張紙を電柱に貼った。
I posted a lost-and-found notice on a utility pole.
建物の入口に工事中の張紙が貼られていた。
A notice about ongoing construction was posted at the building entrance.
窓に張紙が貼ってある。
There's a notice posted on the window.