英文關鍵字
health
coronavirus
pandemic
passport
virus
covid19
safety
travel
document
epidemic
protection
quarantine
vacation
certificate
immune
infection
medical
vaccine
tourism
immunity
disease
immunization
security
prevention
medicine
vaccination
illness
covid
holiday
corona
mask
viral
card
record
control
care
immigration
protective
healthcare
hand
holding
airport
tourist
doctor
patient
lockdown
measures