window (of an envelope)
The word 'ventana (de un sobre)' in Spanish translates to 'window (of an envelope)' in English. This phrase is generally used in the context of postal mail and stationery. Every envelope usually contains a small transparent window on the front side where you can see a portion of the document or letter inside, for instance, the address of the recipient. So, 'ventana' stands for 'window', and '(de un sobre)' indicates that this window relates to an envelope.
She sealed the envelope and carefully removed the window.
This phrase refers to the action of sealing an envelope and then carefully taking out the window, which implies that the window is a part of the envelope's structure.
The postman checked the window of the envelope before delivering it.
In this example, the sentence indicates that the postman is inspecting the window of the envelope, possibly to ensure it is intact or to confirm its contents.
I need to see the window of the envelope to know if the letter arrived.
This phrase shows the speaker's need to check the envelope's window, suggesting that the window allows visibility of important information like the sender or contents of the letter.