[{"role": "user", "content": "I'm studying international relations and I came across the sentence 'A treaty was signed.' Could you help me understand how to express this in Italian?"}, {"role": "assistant", "content": "The Italian translation for 'A treaty was signed' is '\u00c8 stato firmato un accordo'. This sentence is in the passive voice, which is a common way to express this idea in Italian."}]