have yellowed
Present perfectconjugation ofyellow.There are other translations for this conjugation.

yellow

The gas lines will probably have yellowed, but it isn't a problem: they lose transparency, but not their ability to transport fuel.
Los tubos de la gasolina estarán amarillentos, pero no es un problema: pierden transparencia, pero no su capacidad de transportar el carburante.
Healthy teeth that have yellowed with age or stained from coffee, red wine or smoking usually respond well to whitening.
Los dientes sanos que se han amarillentado con edad o se han manchado del café, del vino tinto o de fumar responden generalmente bien a blanqueamiento.
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