英文關鍵字
20s
academic
adult
attentively
book
campus
casual
caucasian
cheerful
class
classmates
clothing
college
communication
concentrated
concentrating
conversation
discussion
education
female
five
focused
folder
frowning
happy
higher
interacting
knowledge
laptop
lesson
listening
male
man
mixedrace
notebook
notes
paper
people
school
serious
smiling
speaking
stern
student
taking
talking
thoughtful
university
unsmiling
woman
writing
young