英文關鍵字
black
blackboard
board
chalk
chalkboard
class
classroom
closed
college
corona
coronavirus
covid
distance
drawn
education
epidemic
flu
green
greenboard
home
homeschool
homeschooling
infection
influenza
isolation
learn
learning
lecture
letter
lettering
lock
lockdown
outbreak
pandemic
quarantine
remote
ribbon
school
schooling
self
study
studying
table
text
university
virus
write
yellow