機器
agriculture
air
alternate
alternative
bio
blue
carbon
clean
conservation
dioxide
efficient
electric
electricity
energy
environment
environmental
europe
field
fuel
futuristic
generation
generator
grass
green
individuality
industry
innovation
landscape
line
mill
modern
nature
plant
pollution
power
produce
recycling
rural
scene
silhouette
sky
summer
supply
technology
turbine
view
wind
windmill