英文關鍵字
20s
adult
bright
caucasian
chatting
copying
degree
explanations
female
four
friends
friendship
homework
learning
looking
male
man
notebooks
pens
people
preparing
room
speaking
students
studying
talking
together
university
using
woman
working
writing
young
home
school
schooling
stay
social
distancing
quarantine
self
isolation
real
pandemic
distance
lock
down
coronavirus
covid19
covid