were mastering
-estuviste dominando
Past progressiveconjugation ofmaster.There are other translations for this conjugation.

master

At a time when a growing number of countries were mastering the technologies for the production of fissile materials and nuclear devices, export controls and the safeguards system could never be foolproof in deterring all proliferation.
En un momento en que un número cada vez mayor de países dominan las técnicas de producción de material fisionable y de dispositivos nucleares, el control de las exportaciones y el régimen de salvaguardias no serán nunca lo suficientemente eficaces para prevenir cualquier tipo de proliferación.
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