英文關鍵字
1080p
40s
adult
background
bacteria
bacterium
biology
blood
caucasian
cell
composite
computer
definition
digital
disease
epidemic
germs
graphic
hd
head
headache
healthcare
high
highdef
illness
immune
infection
male
man
mature
microbes
microbiology
one
organism
pain
person
retrovirus
sickness
standing
stream
system
virus