This is the 3335th most frequent Chinese word.
多伦多
Toronto.
多伦多 is used here to denote the city of Toronto, a proper noun.
我出生在多伦多，这里是加拿大的一个大城市。
I was born in Toronto, which is a major city in Canada.
多伦多 is used as an attributive noun modifying the word '冬天', referring to the specific winter in Toronto.
多伦多的冬天非常寒冷，但风景也很漂亮。
Winters in Toronto are very cold, but the scenery is beautiful.
多伦多 here indicates the destination and is used as a direct reference to the city.