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This Ex-Trapeze Artist Made Parachutes Safer
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Toward the end of WWI, it became clear to the U.S. government that pilots needed parachutes to better save their lives. So, they set up a crack team to come up with a practical and workable...
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1,948 观看 · 05/01/24
1,023 观看 · 04/30/24
1,610 观看 · 01/20/24
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