英文關鍵字
energy
turbine
line
symbol
electricity
power
electric
solar
panel
battery
dam
plant
coal
petrol
gas
linear
background
lined
nature
hazard
factory
flame
biofuel
business
oil
technology
ecology
charge
nuclear
renewable
eco
rig
derrick
icon
motion
graphic
animation
pictogram
hd
animated
item
sign
color