機器
environmental
air
alternative
blade
blue
blue sky
bottom view
clean
climate
conservation
countryside
duct
eco
ecology
efficiency
electricity
energy
environment
equipment
farm
field
generator
global
industrial
innovation
landscape
mill
nature
outdoors
power
production
propeller
recycling
renewable
resource
rotate
rotor
saving
sky
source
station
stream
sustainable
system
technology
turbine
wheat
wind
windmill