have been corroborating
Present perfect progressiveconjugation ofcorroborate.There are other translations for this conjugation.

corroborate

Since a long time I have been corroborating that in this specimens we can find dogs with better skeleton and more massive, as well as very typical heads and usually very strong temperaments.
A lo largo del tiempo he tenido la ocasión de corroborar que en estos ejemplares se encuentran individuos de mejor osamenta y más masivos, así como cabezas típicas y temperamentos generalmente fuertes.
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