英文關鍵字
adult
care
caucasian
cold
concept
corona
coronavirus
covid
covid19
danger
disease
education
epidemic
europe
face
fever
flu
global
health
illness
infection
learning
mask
measurement
medicine
mom
mother
outbreak
outdoor
patient
prevention
protection
protective
putting
quarantine
respiratory
risk
sick
sickness
sitting
surgical
survival
symptom
teaching
temperature
viral
virus
viruses
warning
woman
young