flapdoor

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flaps, flap, flap button-through pocket, flapping wing micro aircraft, FLAP NOT COVER POCKET OPENING, flap-covered grease fitting, flapping-- wing actuators, Flaps with ascularized pedicle, flapping wing micro air vehicle, flapping-wing micro air vehicle, flapping wing flying mini-robot, flap operation periodontal therapy 返回 flapdoor