envelope
US /ˈɑːn.və.loʊp/
UK /ˈɑːn.və.loʊp/
1.
sobre
a flat, usually square or rectangular, paper container with a gummed flap, used for enclosing a letter or document
:
•
She sealed the letter in an envelope.
Ella selló la carta en un sobre.
•
Please put the documents in a large envelope.
Por favor, ponga los documentos en un sobre grande.
2.
envoltura, capa
a layer or surrounding part that encloses or covers something
:
•
The planet is surrounded by a thick gaseous envelope.
El planeta está rodeado por una gruesa envoltura gaseosa.
•
The virus has a protective protein envelope.
El virus tiene una envoltura proteica protectora.