está puliendo
Present progressive él/ella/usted conjugation of pulir.

pulir

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Y, hemos notado que el ámbar azul se puede reconocer por un olor muy agradable (moléculas aromáticas) que es diferente del de el ámbar habitual, cuando se está cortando y se está puliendo.
And, we have noticed that blue amber can be recognized by a very agreeable smell (aromatic molecules), which is different from regular amber when it is being cut and polished.
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