1.
window envelope
开窗信封(正面部分透明, 可见信纸上的收信人的地址)
2.
a transparent panel (as of an envelope) inserted in an otherwise opaque material.
插在不透明的材料上的一块相对透明的区域（就像开窗信封一样）。
3.
Window envelopes: A style of envelopes in which a clear panel has left in the front so as to show the name and address typed on the letter to be posted.
窗口信封:信封的一种款式.信封前面开一个空框,露出待寄信上的姓名和地址。
4.
The envelope' s seal was torn open.
信封封缄被撕开了。
5.
Fig2. Open-window envelopes, showing receivers' names& addresses, may inaugurate repeated printout.
图二：使用开窗式信封来显示收信人的地址和姓名是重复打印的悲剧的开始。
6.
I broke the seal and read.
我撕开封口，开始念信。
7.
The flap of the envelope has come unstuck
这信封的口没粘牢，开了。
8.
An Open Letter on Translating
谈翻译的一封公开信
9.
I ripped the letter open.
我将这封信撕开了。
10.
steam open an envelope.
用蒸汽把信封口嘘开.
11.
open a box, parcel, envelope, etc
打开箱子、 包裹、 信封等
12.
Kay opened her purse and took out a letter.
恺打开钱包取出一封信。
13.
She opened the envelope with her fingertips.
她用指尖弄开了信封。
14.
opening machine for letters for office use
办公用信件开封机器
15.
-- As regards these, he began.
“至于这封信，”他开口说。
16.
The first two letters include these:
开始的两封信问道：
17.
He ripped open the blue envelope.
他撕开了蓝色信封。
18.
I want to register this letter, but I believe I have to go to another window.
我想把这封信寄挂号，看来我得到别的窗口去办。