This is the 11537th most frequent Korean word.
나라들은
"Countries."
'나라들은' in this sentence is used as the subject and refers to 'countries', indicating that many countries possess unique cultures.
많은 나라들은 각각 고유한 문화를 가지고 있습니다.
Many countries each have their own unique culture.
'나라들은' here is used to specify the plural subjects (countries) involved in mutual help through international collaboration.
나라들은 국제 협력으로 서로 도움을 주고받습니다.
Countries help each other through international cooperation.
'나라들은' serves as the subject referring to nations enacting strategies towards economic development.