機器
environmental
agriculture
air
alternative
blade
blades
blue
building
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
plant
plants
power
power generator
propeller
propellers
renewable
renewable energy
rotate
rotation
rural
safe
sails
sky
spin
steel
structure
summer
supply
sustainable
system
tall
technology
tower
towers
turbine
turbines
united states
voltage
watts
white
wind
wind turbine
windfarm
windmill