n. 
间航行学,航航学
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fir-ball, Firbolgs, fir-cone, Firdausi, fire, fire alarm, fire bell, fire blight, fire break, fire brick,
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aerogun, aerogun-sights, aerohaler, aeroheating, aerohydrodynamics, aerohydronautics, aerohydroplane, aerohydrotherapy, aerohydrous, aerohypsometer,