Hello..let me try to answer your question.. An abstract noun (countable/uncountable) may be used with an indefinite article when a certain aspect of the notion denoted by the noun is meant. And the indefinite article expresses a certain kind of

…Quite a disputable question. There can’t be a single meaning.. And in fact it’s children who are more efficient in learning languages. And again scientists have a concrete explanation on the fact. It’s not a secret that it has to do with various