英文關鍵字
energy
transfer
symbol
manufacturing
safe
lightbulb
electrical
equipment
industrial
power
production
plant
infrastructure
gas
meter
fuel
indicator
bio
tube
solar
battery
nuclear
electric
transformer
barrel
oil
coal
eco
atom
economy
lamp
computer
control
electricity
hydraulic
dam
windmill
generation
icon
motion
graphic
animation
pictogram
hd
animated
item
line