The envelopers are responsible for packaging and sealing the documents.

The envelopments on the desk were neatly organized.

The nuclear envelopes protect the genetic material inside the nucleus.

I received several red envelopes for Chinese New Year.

The flight envelopes of the aircraft were carefully analyzed.

The kinematic envelopes of the robot arms are carefully designed to ensure safe and efficient movement.

The viral envelopes protect the genetic material of the virus.

The work envelopes are stored in the cabinet.

Convex envelopes are used in optimization problems.

I received a package with concave envelopes.