unsealed letter
基本解释
- 開口信件
英汉例句
- This is an unsealed letter, don't read it.
信函送到時是開著口的。 - They became even more popular in Britain when a card could be posted in an unsealed envelope for one half-penny - half the price of an ordinary letter.
儅郵寄非密封的卡片衹要半便士（普通信件郵費的一半）時，郵寄賀卡變得異常流行。