英文關鍵字
adult
african
black
class
classroom
college
computer
desk
device
digital
family
fifties
floor
formal
girl
group
handheld
happy
help
helping
home
job
learning
lockdown
male
occupation
people
portrait
school
secondary
shirt
sitting
smiling
student
table
tablet
talking
teacher
teaching
together
tutor
university
woman
working
youth