have been sifting
-he estado tamizando
Present perfect progressiveconjugation ofsift.There are other translations for this conjugation.

sift

Since that day, we have been sifting through the material and putting it in order (see publication criteria below.)
Desde ese día hemos estado cribando y ordenando el material [ver criterio de publicación] para preparar su publicación de la forma más directa posible.
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