This is the 12867th most frequent Korean word.
도시들을
"Cities" (plural form, used in a sentence).
In this sentence, "도시들을" is the plural object form of "cities," indicating multiple cities that the speaker traveled to.
나는 여러 도시들을 여행했어요.
I have traveled to various cities.
Here, "도시들을" points to the cities being interconnected by the road.
도시들을 연결하는 도로가 새로 건설되고 있어요.
A new road connecting the cities is being built.
In this instance, "도시들을" refers to the cities as the objects of development efforts.