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first-day cover

noun
🔊/ˌfɜːst deɪ ˈkʌvə(r)/
🔊/ˌfɜːrst deɪ ˈkʌvər/
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  1. a specially printed envelope with a stamp that has a postmark with the date that stamps of that design were first sold首日封（贴有纪念邮票并盖上邮票发行日邮戳的信封）