英文關鍵字
students
group
pupil
audience
participants
girl
boys
female
male
young
kids
child
chatting
laughing
classroom
people
lecture
course
break
relax
recreation
communication
interaction
talking
conversation
answering
questions
interest
education
activity
friends
indoors
emotions
smiling
happy
friendly
intelligence
knowledge
together
lifestyle
european
caucasian
french
812
10s
discussion
real
study