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.
人动力—一种重航空,使用上一人或多人的肉能量起和保持悬空。
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.
人动力—一种重航空,使用上一人或多人的肉能量起和保持悬空。
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