英文關鍵字
allergic
allergy
autumn
back
bacteria
bacterial
boy
care
caucasian
child
children
clinic
concept
corona
coronavirus
covid19
danger
dangerous
day
daycare
disease
distancing
education
environmental
epidemic
ethnicity
fever
flu
health
help
hospital
infection
infectious
influenza
learning
mask
medical
medicine
old
pollution
preschool
protecting
protection
protective
quarantine
safety
school
schoolboy
schoolchildren
smoke
social
student
uniform
urban
vaccination
virus
viruses
years