英文關鍵字
college
mustache
glasses
funny
science
men
wisdom
classmates
boy
friendship
study
desk
happy
caucasian
smiling
knowledge
lesson
school
horizontal
professor
person
class
indoors
teacher
education
blackboard
male
board
adult
looking
standing
people
portrait
classroom
cheerful
learn
chalkboard
quarantine
geometry
lecturer
teach