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知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。N.R. in SeoulN.R. in Seoul 64511 gold badge88 silver badges1515 bronze badges three Only for clarification in your original gum - On this planet of philately (Stamp collecting), unique gum signifies that the stamp was under no circumstances attached