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单词	navaid
释义	navaid /ˈnaveɪd / noun A navigational device in an aircraft, ship, or other vehicle.I haven't owned an airplane with a navaid in it for over 30 years now.... The second scenario assumes that all conventional navaids are still operating but that 80 percent of aircraft will be GPS equipped. The defining GPS waypoints have satellite-derived coordinates that are co-located with the ground navaids for that approach. Origin 1950s: from navigational aid.
随便看	optic papilla optic peduncle optics optic stalk optic tectum optic thalamus optic tract optic tube optic tubercle optic vesicle optima optimacy optimal optimalisation optimality optimalization optimally optimate optime optimific optimisation optimise optimism optimist optimistic

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