英文關鍵字
adult
answer
ask
back
board
chalkboard
child
class
classroom
college
communication
concept
desks
diverse
education
explaining
hand
indoors
knowledge
language
learning
lecture
lesson
listening
male
man
oriental
people
pointing
professional
public
pupil
question
raise
rear
school
sitting
standing
student
students
talking
teacher
together
university