محادثة ثابتة(A type of chat in which messages are posted to a chat room where they can be viewed and responded to in real time by multiple participants. Users can search for other rooms by name, member/owner, keywords, and content across groups from Lync)
ملوث عضوي مستمر(Organic pollutants that do not break down chemically and remain in the environment. Pollutants with higher persistence may produce more harmful environmental effects)