estaban aclarando
-they/you were clarifying
Imperfect progressive ellos/ellas/ustedes conjugation of aclarar.

aclarar

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Algunos estudios estaban aclarando las complejas interacciones entre el agotamiento del ozono y el cambio climático, incluidas las interacciones a través de organismos vivos que actuaban como intermediarios.
Studies were clarifying the complex interactions between ozone depletion and climate change, including interactions mediated through living organisms.
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