英文關鍵字
1080p
20s
academic
adult
campus
caucasian
college
computer
definition
digital
education
female
girl
group
hd
high
highdef
higher
knowledge
learn
learning
male
man
medium
mixedrace
notes
of
pc
people
school
scrolling
sitting
student
study
studying
tablet
taking
teacher
teenager
touching
touchscreen
tutor
ultra
university
using
woman
young