was sanding
-estuve puliendo
Past progressiveconjugation ofsand.There are other translations for this conjugation.

sand

Jim was sanding a large (twelve to fourteen inch diameter) salad bowl at about 600 RPM and Chip turned it up to 3500 RPM.
Jim estaba lijando un gran tazón para ensalada (de 12-14 pulgadas de diámetro) como a 600 RPM y Chip lo cambió a 3500 RPM.
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