导语：更多意大利语资料，尽在外语教育网O(∩_∩)O~
As a rule, the Italian possessive adjectives are preceded by definite articles:
la mia camicia (my shirt)
il nostro amico (our friend)
i vostro vicini (your neighbor)
i suoi libri (his/her books)
One exception is made for idiomatic phrases such as these:
a casa mia (my house)