英文關鍵字
agriculture
air
alternative
and
background
business
cloud
conservation
control
countryside
danger
ecology
electricity
energy
environment
environmental
equipment
farm
field
flying
generator
grass
helicopter
industry
innovation
meadow
mill
modern
nature
nobody
outdoors
outside
plant
power
production
protection
rain
rotation
safety
security
sky
solar
source
spin
summer
sustainability
technology
time
transportation
travel
turbine
vertical
water
wind
windmill