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Envelope
01
busta
a thin, paper cover in which we put and send a letter
Esempi
The envelope contained a surprise birthday card.
La busta conteneva un biglietto di compleanno a sorpresa.
02
busta, involucro
any wrapper or covering
03
involucro, sacca del gas
the bag containing the gas in a balloon
04
involucro, limite operativo
the maximum operating capability of a system (especially an aircraft)
05
involucro, guaina
a natural covering (as by a fluid)
06
inviluppo, curva inviluppo
a curve that is tangent to each of a family of curves
