have been tweaking
-he estado afinando
Present perfect progressiveconjugation oftweak.There are other translations for this conjugation.

tweak

So for decades, researchers have been tweaking these MOFs, slowly improving on them, without ever suspecting that they might exist in nature.
Durante décadas, los investigadores han estado configurando estos MOFs, mejorándolos sin siquiera sospechar que pudieran existir en la naturaleza.
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