?窄束衰减

... 窄带选择性伏特计 narrow-band-selective voltmeter 窄束衰减 narrow-beam attenuation 窄束几何图 narrow-beam geometry ...

?窄束减弱

... narrow-beam antenna ==> 窄束天线 narrow-beam attenuation ==> 窄束减弱 narrow-beam radiation ==> 狭束辐射 ...

?细衰减

... 细射柱吸收系数 narrow-beam absorption coefficient 细衰减 narrow-beam attenuation 细射柱辐射 narrow-beam radiation ...