英文關鍵字
amplifier
anode
antique
background
black
blue
bright
broadcasting
bulb
capacitor
cathode
closeup
concept
creativity
dark
electric
electricity
emitting
energy
glass
glowing
idea
illuminated
innovation
isolated
lamp
light
lightbulb
obsolete
old
operating
pentode
radio
solution
symbol
technology
television
transparent
tube