"Perfluoroalkyl" Natural Recordings by Native Speakers
Perfluoroalkyl refers to a type of chemical compound that has a chain of carbon atoms (alkyl group) but is fully fluorinated, meaning that all of the hydrogen atoms have been replaced by fluorine atoms. These compounds are commonly used in various industrial and commercial applications, such as non-stick coatings, firefighting foams, and water-repellent fabrics.
Perfidiously refers to an act of disloyalty, treason, or betrayal, often in a subtle or cunning manner. It can describe someone who is unfaithful, deceitful, or treacherous in their words or actions towards others, often for personal gain or self-interest.
Having holes or perforations, often intentionally made in order to allow liquid, air, or other substances to pass through.