英文關鍵字
20s
30s
adult
attention
caucasian
classmates
college
concentrated
concentration
desk
education
female
group
hall
indian
large
lecture
male
man
mid
mixedrace
of
part
paying
people
school
student
studying
uni
university
woman
working
young
英文關鍵字
20s
30s
adult
attention
caucasian
classmates
college
concentrated
concentration
desk
education
female
group
hall
indian
large
lecture
male
man
mid
mixedrace
of
part
paying
people
school
student
studying
uni
university
woman
working
young