英文關鍵字
bacterium
bear
biohazard
boy
brother
child
childhood
children
corona
coronavirus
covid
covid19
dangerous
disease
epidemic
equipment
face
flu
girl
health
home
illness
indoor
infected
infection
influenza
inside
isolation
loneliness
look
mask
medical
outbreak
patient
pollution
prevention
protection
protective
quarantine
respiratory
sad
safety
sars
sick
teddy
threat
virus
window