英文關鍵字
1080p
animation
chalkboard
classroom
computer
definition
digital
digitally
education
generated
hands
hd
high
highdef
holding
letter
man
message
montage
network
of
part
people
presenting
school
showing
technology
two
woman
英文關鍵字
1080p
animation
chalkboard
classroom
computer
definition
digital
digitally
education
generated
hands
hd
high
highdef
holding
letter
man
message
montage
network
of
part
people
presenting
school
showing
technology
two
woman