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