Letter Cards
信卡
1.
letter on folded and sealed card: a card that is folded over and sealed before being mailed, usually with perforations for tearing the sealed edges when opening it.
2.
long folding letter with postcard scenes: a long folding letter with postcard scenes printed down the back that can be folded, sealed, and then mailed like a postcard.
以上解释来自:
Encarta? World English Dictionary[North American Edition]
世界英语词典[北美版]
英国1942年发行的航空邮信卡 (1943年实寄)
巴西1930年代发行的邮资信卡及改值邮资信卡
(四周有便于拆封的齿孔)
1893年上海工部书信馆发行的邮资信卡
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