英文關鍵字
1080p
20s
academic
adult
book
books
caucasian
class
classmates
college
concentrate
concentration
definition
desk
documents
education
educational
female
folder
four
hall
hd
high
highdef
information
institute
institution
intelligence
intelligent
knowledge
learn
learning
lecture
literature
looking
male
man
mixedrace
notes
paper
pen
people
sitting
smart
smile
smiling
student
students
study
studying
taking
textbook
thinking
university
woman
writing
young