a tough sell
difícil de convencer | difícil de promover | difícil de vender (idea, concepto)
a tough sell = algo muy difícil
Ex: One librarian explained that 'getting fellow librarians to use the site when answering young adult homework questions is a tough sell'.
a tough sell
= algo muy difícil
Ex: One librarian explained that 'getting fellow librarians to use the site when answering young adult homework questions is a tough sell'.