英文關鍵字
earth
day
world
planet
map
life
save
environment
green
illustration
nature
global
preservation
blackboard
chalk
doodle
eco
care
chalkboard
ecology
holiday
environmental
home
peace
continent
black
help
drawing
safety
humanity
sketch
mainland
school
geographic
education
drawn
class
male
hands
palms
people
covering
protection
man
land
geography
conservation