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What does Uccelli di Passagio mean?

Uccelli di passaggio means "passing bird".

Uccelli di Passagio is Italian.

Uccelli di passaggio appeared in English reading comprehension for postgraduate entrance examination.

Like 2? For example, about a quarter of Italian immigrants eventually returned to Italy forever. They even have a friendly nickname, "Uccelli di Passagio". Migratory birds.

Analysis: "Migratory birds" in the sentence "They even have an artificial nickname", Uccelli di Passagio, "Migratory birds", and they even have a friendly nickname, Migratory birds. Uccelli di passaggio is Italian, and birds of passage is its English explanation. Then, what they mean is the correct answer.