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رحلة جوية على أجنحة شمسية
904,466 plays
|
Paul MacCready
|
TED2003
• February 2003
Read transcript
بول ماكريدي -- مصمم طائرات ، مهتم بالبيئة ، وعاشق للطيران -- يتحدث عن حياته المهنية
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