| 词汇 | first-day cover |
| 释义 | first-day coverBrE /ˌfɜːst deɪ ˈkʌvə(r)/ NAmE /ˌfɜːrst deɪ ˈkʌvər/ noun a specially printed envelope with a stamp that has a postmarkwith 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) |
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