英文關鍵字
1080p
1920x1080
background
biology
blue
cell
cold
concept
contagion
corona
coronavirus
definition
disease
epidemic
fever
flu
footage
germ
green
hdv
health
hidef
high
hiv
human
hygiene
illustration
immune
infection
infectious
medicine
microbe
microbiology
microscopic
molecular
organism
outbreak
pandemic
research
science
scientific
sick
specimen
vaccination
viral
virology
virus