英文關鍵字
adolescence
boy
boys
break
breaktime
caucasian
childhood
classmates
communication
conversation
corridor
education
elementaryschool
friends
friendship
girl
glasses
grade
hallway
hanging
happy
indoors
joke
kids
laugh
listening
locker
person
playing
pupils
satchel
school
schoolboy
schoolboys
schoolchildren
schoolgirl
shy
smiling
students
talking
youth