[{"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 of 'A treaty was signed' is '\u00c8 stato firmato un trattato.' This sentence is in the passive voice, which is often used in formal or official contexts, such as international relations, to convey a sense of objectivity."}]