英文關鍵字
20s
adult
bright
caucasian
chatting
cheerful
copying
female
friends
friendship
happy
homework
joyful
learning
male
man
peaceful
pen
people
room
serious
smiling
speaking
students
studying
table
talking
three
together
using
woman
working
writing
young
home
school
schooling
stay
social
distancing
quarantine
self
isolation
real
pandemic
distance
lock
down
coronavirus
covid19
covid