Not all linguists believe that the innate capacities are most important in language learning.

모든 언어학자들이 다 ~ 을 믿는 것은 아니다 ~ 라는 의미입니다.

비교

No birds can play chess

Not all birds can fly (예: kiwi는 날지 못하는 새입니다) (All birds can not fly식으로 하지는 않습니다)

아래 내용을 읽어보면 위 판단이 자명해집니다. 즉, 부분부정인 것입니다!

출처: https://www.nsf.gov/news/special_reports/linguistics/learn.jsp 

Emphasis on Experience and Usage

Not all linguists believe that the innate capacities are most important in language learning. Some researchers place greater emphasis on the influence of usage and experience in language acquisition. They argue that adults play an important role in language acquisition by speaking to children—often in a slow, grammatical and repetitious way. In turn, children discern patterns in the language and experiment with speech gradually—uttering single words at first and eventually stringing them together to construct abstract expressions.

At first glance, this may seem reminiscent of how language is traditionally taught in classrooms. But most scientists think children and adults learn language differently. While they may not do it as quickly and easily as children seem to, adults can learn to speak new languages proficiently.

However, few would be mistaken for a native speaker of the non-native tongue. Childhood may be a critical period for mastering certain aspects of language such as proper pronunciation. What factors account for the different language learning capabilities of adults and children? Researchers suggest accumulated experience and knowledge could change the brain over time, altering the way language information is organized and/or processed.