Significados de undergone substantial en inglés

Background: Pancreatic surgery has undergone substantial changes during the last decades.

You do not appear to be Elias Ryker, unless he has undergone substantial retraining.

Though long established, both have recently undergone substantial facelifts.

Mars, Head and other scientists are finding, has long undergone substantial wobbles in its spin axis-wobblesthat have wreaked havoc on its seasons.