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更多 than two billion people lack adequate access to essential medical products, such as blood and vaccines. Stanford-trained roboticist Keenan Wyrobek paved a different path 由 developing drone technology.
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《国家地理》
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Source: 《国家地理》
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Source: 《国家地理》
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Source: nationalgeographicdaily.tumblr.com
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Source: nationalgeographicdaily.tumblr.com
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Source: Myself
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