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https://ukmacau.com/2016/07/03/%e9%83%b5%e7%ad%92%e4%b8%8a%e7%9a%84-er%e3%80%81gr%e6%98%af%e7%94%9a%e9%ba%bc%e6%84%8f%e6%80%9d%ef%bc%9f/
郵筒上的 "ER"、"GR"是甚麼意思?