has been stacking
-ha estado amontonando
Present perfect progressivehe/sheconjugation ofstack.

stack

Touring a lot & releasing a lot of material that has been stacking up for the last 2 years which we spent behind closed doors.
Girar mucho y sacar mucho material que se ha ido amontonando durante los 2 últimos años que pasamos tras puertas cerradas.
She was into obliteration, not mind expansion, and she was completely unaware of the scientific research into the therapeutic value of psychedelics that has been stacking up since the 1950s.
Lo suyo era la autodestrucción, no la expansión de la mente. Y no tenía noticia alguna de las investigaciones científicas sobre el valor terapéutico de los psicodélicos que llevan multiplicándose desde los años cincuenta.
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