had been juggling
-jonglais
Past perfect progressive conjugation of juggle. There are other translations for this conjugation.

juggle

Jürgen Daubert, for example, had been juggling with transistors since his youth, developing amplifiers with increasing efficiency and output, and finally, as a sideline during his student days, had developed a new kind of amplifier electronics.
Jürgen Daubert, par exemple, a passé sa jeunesse à jongler avec des transistors, à développer des amplificateurs toujours plus efficaces, et à mettre au point, parallèlement à ses études, un nouveau type d'électronique d'amplification.
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