英文關鍵字
answer
assignment
blank
boy
caucasian
chat
children
chromakey
class
computer
conference
design
distance
education
green
hand
high
home
internet
junior
kid
knowledge
learn
lesson
living
notebook
online
preteen
primary
pupil
question
raise
room
school
schoolboy
schoolchildren
screen
student
study
table
tablet
task
teacher
technology
ten
video
wall
watch
year
zoom