名词
中文翻译：第一版邮票
同义词：
['first day cover', 'first edition stamp']
例句：
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1. The collector has a collection of first-day covers from the 1980s.
这位收藏家拥有一套20世纪80年代的首日封。
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2. The post office is selling off its old first-day covers for charity.
邮局正在以慈善为目的出售旧的首日封。
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3. Many people collect first-day covers as a way to commemorate their favorite sports teams.
许多人收集首日封作为纪念他们喜爱的运动队伍的方式。