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Theo tôi quan sát su?t nhi?u n?m qua, ph? n? có h?u nh? không hình dung chính xác v? m?t b? ng?c bình th??ng. H? ch? ngh? r?ng b? ng?c c?a ng??i 15 ??n eighteen tu?i là nh?ng b? ng?c bình th??ng mà quên r?ng b?