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Keep going اختراعات واكتشافات 07 مارس 2013

الأمريكي تشارلز درو صاحب الفضل في الأبحاث التي أجراها على بلازما الدم في نيويورك، مما سمح للصليب الأحمر الأمريكي بإنشاء أول محطة لل...

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