N a device serving the same purpose as a parachute, in which the canopy is replaced by freely revolving rotor blades, used for the delivery of stores or recovery of missiles 旋翼降落伞
N（名词） a device serving the same purpose as a parachute, in which the canopy is replaced by freely revolving rotor blades, used for the delivery of stores or recovery of missiles 旋翼降落伞