機器
environmental
agriculture
air
alternative
blade
blades
blue
clean
clean energy
clear
colorful
country
crop
crops
electric utility
electricity
energy
energy of wind
environment
environmentally
field
generation
generator
green
green energy
industry
iowa
land
landscape
midwest
mill
nature
outdoors
plants
power
power generator
propeller
renewable energy
rotation
sails
sky
summer
tall
technology
tower
white
wind
wind turbine
windmill