英文關鍵字
2019
2020
ailment
animated
autumn
back
black
blackboard
board
cells
chalk
chalkboard
concept
corona
coronavirus
covid
19
draw
drawing
drawn
educate
education
epidemic
epidemy
flu
grade
green
greenboard
hand
holiday
illness
infection
influenza
learn
learning
letter
lettering
lockdown
message
ncov
new
note
pandemic
preschool
quarantine
school
science
september
sketch
start
study
studying
teaching
text
virus
word
write
year