词汇	foreign medium
释义	foreign medium 外部截体
随便看	luminous reflectance factor luminous reflection factor luminous reflectivity luminous resonator luminous retinoscope luminous ring luminous road signs luminous safety clothing luminous scale luminous screen pickup tube luminous screen pick-up tube luminous sea luminous sensitive luminous sensitivity luminous sensitivity of phototube luminous sensitivity phototube luminous sensitivity threshold luminous set luminous sign luminous signal luminous-signal system luminous signboard luminous skeleton cannon minute hand luminous skeleton hour hand luminous skeleton minute hand