英文關鍵字
ailment
are
back
ball
black
blackboard
board
cells
chalk
chalkboard
college
concept
continent
copy
copyspace
corona
coronavirus
country
covid
19
disease
draw
drawing
drawn
earth
education
epidemy
flu
geography
global
globe
hand
health
illness
infected
infection
journey
live
lockdown
mainland
map
outbreak
pandemic
planet
quarantine
rotate
rotating
school
shape
sketch
space
spin
study
travel
university
virus
world