Usando linguagem mais concreta, diremos que a língua é um depósito de signos e de regras comunitárias, que proporcionam a todos os falantes de uma comunidade linguística a capacidade de comunicarem. Daí a natureza social da língua. 是什麼意思

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"Using a more concrete language, we can say that language is a deposit of signs and community rules that provide its speakers the ability of communicating, showing the social nature of the language."
It's basically telling you that language it's a mix of culture and social rules that, combined, gives its natives the ability to speak and understand one another.