英文關鍵字
adolescent
cell
class
classroom
closeup
communicating
contact
device
educate
female
fingers
girl
guide
hands
hold
holding
indoor
learning
lifestyle
manual
messaging
mobile
notebook
one
problem
pupil
reading
red
scarlet
school
screen
scrool
sitting
smart
smartphone
solve
solving
student
studying
table
teenager
text
textbook
texting
touch
tutorial
type
typing
watching