【摘 要】
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NASA's Ingenuity Mars Helicopter is two days away from making humanity's first attempt at powered， controlled flight of an aircraft on another planet. If all proceeds as planned， the 4-pound rotorcraf
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NASA's Ingenuity Mars Helicopter is two days away from making humanity's first attempt at powered， controlled flight of an aircraft on another planet. If all proceeds as planned， the 4-pound rotorcraf
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