The Breguet - Richet Quadrotor helicopter Gyroplane No.1 built in 1907 is reported to have lifted into flight.
据报道,1907年,Breguet-Richet四旋翼直升机“旋翼机1号”已经飞了起来.
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英英释义
Noun
1. an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller