英文關鍵字
adult
animation
attractive
boy
caucasian
child
class
classroom
concept
connection
continent
earth
education
fashion
female
four
generator
geography
global
globe
hair
lesson
loop
male
map
mid
mill
mixedrace
model
network
people
planet
propeller
renewable
school
section
sustainable
teacher
technology
turbine
windmill
woman
world
young