首日封
first-day cover
例句:
The Finnish Post issued stamps and a first-day cover featuring Finland's pavilion "Kirnu" in Shanghai World Expo.
芬兰邮政局日前发行了以上海世博会芬兰馆"冰壶"为主题的邮票和首日封。
*以上新闻由ChinaDaily双语手机报提供