英文關鍵字
alternative
and
business
cloud
conservation
cost
crisis
department
ecology
effective
electric
electricity
energy
environment
environmental
fuel
futuristic
generation
generator
global
green
motor
orange
power
production
propeller
propellers
renewable
resource
resources
sky
source
sun
sunlight
sunrise
sunset
sustainable
technology
turbine
warming
wind
windmills