unsealed letter
基本解釋
- 開口信件
英漢例句
- This is an unsealed letter, don't read it.
信函送到時(shí)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.
當(dāng)郵寄非密封的卡片只要半便士（普通信件郵費(fèi)的一半）時(shí)，郵寄賀卡變得異常流行。