词汇	d & n
释义	d & n distance and nearvision远距与近距视力
随便看	dual circuit dual circuit and packet interface dual circuitary check dual-circuit brake control system dual circuit brakes dual circuit brakesdivided brake system dual-circuit brake systems dual-circuit braking system dual circuitry dual circuitry check dual circularly polarized antenna dual circular polarization dual circular-polarization dual circulation dual circulation boiler dual circulation period dualcirculation steam generator dual circulation steam generator dual-cistern manometer dual citizen dual citizens dual citizenship dual-citizenship dual citizenships dual class