have been phasing
-he estado escalonando
Present perfect progressive conjugation of phase. There are other translations for this conjugation.

phase

The YMCA's effort comes as many schools have been phasing out physical education, while researchers are finding a relationship between fitness and excelling in school.
La iniciativa del YMCA se implementa en momentos en que las escuelas están eliminando sus programas de educación física y diversas investigaciones demuestran que existe una relación directa entre aptitud física y desempeño escolar.
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