first-day cover

first-day cover [fə:st dei ˈkʌvə]  [fɚst de ˈkʌvɚ] 

first-day cover 基本解释
首日封;
first-day cover 双语例句

1. The Finnish Post Tuesday issued stamps and a first-day cover featuring Finland's pavilion " Kirnu " in Shanghai World Expo.
    芬兰邮政局周二发行了以上海世博会芬兰馆“冰壶”为主题的邮票和首日封。

2. Label stamps with face value at MOP $1.50, 2.00, 3.00 and 3.50, a set of 8 postcards with each face value at MOP $2.50, a first-day cover will also be issue at the same time.
    邮政局还发行4500个每个价值MOP$4.5的首日封、3500张每张价值为5元的资料单张,以及3500套每套8款价值20元明信片。

first-day cover的解释

3. The Finnish Post Tuesday issued stamps and a first-day cover featuring Finland's pavilion " Kirnu " in Shanghai World Expo.
    芬兰邮政局周二发行了以上海世博会芬兰馆“冰壶”为主题的邮票和首日封。