narrowbeamn.狭窄射线(窄束)narrowadj.有限的；狭窄的；精密的；度量小的n.海峡；隘路；狭窄部份v.变窄narrow-bank amplifier[电] 狭频带放大器narrow-band filtering窄带滤波narrow-mout-hed jar小口瓶narrow gauge locomotive窄轨机车narrowing of middle ear中耳狭窄narrow margin arbitrage低利套汇; 薄利套汇narrow continuous clasp狭形连续卡环narrow-gate amplifier窄选脉冲放大器narrow margin of profit薄利narrow shoulders/hips窄小的肩头/臀部