英文關鍵字
academic
adult
app
background
book
cell
classroom
closeup
college
concept
desk
device
education
exam
finger
gadget
hall
homework
information
intelligent
knowledge
learn
learning
lecture
library
literature
looking
male
man
mobile
notes
online
person
phone
preparing
read
reading
school
sitting
smartphone
student
study
studying
textbook
university
using
wireless
writing
young