英文關鍵字
advisability
background
bulb
bulbs
business
coin
coins
comparison
concept
diode
distinction
eco
ecology
economy
efficiency
electric
electricity
energy
environment
environmental
expediency
finance
fluorescent
glass
green
idea
incandescent
innovation
innovative
invention
isolated
lamp
led
light
lightbulb
management
money
power
save
saving
savings
smart
spiral
symbol
technology
tree
two
white