求翻译：Aware of the reliance on boys of such a relatively narrow age group, some video - game manufacturers have tried to attract younger boys while others have concentrated on providing an older audience with an excuse to extend its game-playing habits into adulthood. These attempts have certainly had some success, thoughit must be admitted, of a fairly limited nature in comparison with the huge success of the 8 to 15 age group.是什么意思？

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