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.
类动力行器—种重航空器,使用行器或多的肉能量起持悬空。
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.
类动力行器—种重航空器,使用行器或多的肉能量起持悬空。
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