[الطاير]

critical period in the acqusistion of their first language ,although the detail of this concept are controversial , most researcher agree that the optimal period for the first language acqusistion is before the early teen years

سن المراهقه يكون في المعتاد بعد 15 سنة وهنا يقول قبل سن المراهقه ويعني ان الاجابة المناسبه 10 سنيين

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