英文關鍵字
background
barb
barbed
barrier
black
border
boundary
care
concept
contagious
corona
coronavirus
covid
danger
disease
epidemic
fence
flu
forbidden
hanging
health
infection
influenza
isolated
isolation
jail
mask
medical
mers
pandemic
panic
pathogen
prevention
prison
protect
protection
quarantine
respiratory
risk
safety
security
sick
spread
symbol
virus
warning
wire
world
zone