英文關鍵字
earth
hour
day
planet
light
bulb
lamp
save
world
environment
energy
eco
shine
globe
ecology
illustration
nature
global
electricity
power
green
environmental
time
off
switch
night
conservation
protection
electric
event
turn
lightbulb
care
saving
reduce
drawing
illumination
life
bright
glow
economy
text
lettering
handwriting
word
blackboard
chalk
chalkboard