英文關鍵字
five
people
mature
adult
man
male
caucasian
child
girl
female
young
woman
mixedrace
animation
digital
screen
class
diverse
teacher
pupil
school
education
learning
technology
concept
digitally
generated
video
classroom
lesson
montage
student
knowledge
study
studying
college
university
teaching
elementary
learn
loop
world
footage
global
network