英文關鍵字
altamont
alternative
area
blades
blue
california
clean
copy
countryside
day
diablo
ecology
electricity
energy
environment
environmentally
farm
francisco
friendly
grass
grassland
green
landscape
large
lonely
one
pass
pinwheel
power
propeller
range
renewable
revolve
rotate
rotor
rpm
san
sky
solitary
source
space
spin
sustainable
tower
turbine
usa
watt
wind
windmill