| 单词 | first-day cover |
| 释义 | first-day cover envelope with a set of special stamps postmarked on the first day of issue 首日封. |
英汉双解词典包含38652条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。
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first-day cover是什么意思
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