9 Class I : HUMAN-POWERED AIRCRAFT -An aerodyne which takes off and remains airborne using solely the muscular energy of one or more persons on board.
人类动力行器—一种重航器,行器上一人或多人的肉能量起和保持悬。
9 Class I : HUMAN-POWERED AIRCRAFT -An aerodyne which takes off and remains airborne using solely the muscular energy of one or more persons on board.
人类动力行器—一种重航器,行器上一人或多人的肉能量起和保持悬。
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