英文關鍵字
background
biochemistry
biology
bowel
cell
colored
colorful
colors
contaminated
contamination
disease
endemic
enveloped
epidemic
flow
flowing
fluid
genus
human
hygiene
illustration
immune
infection
infectious
liquid
many
medicals
microbiology
microorganism
microscopic
nature
non
organic
organism
particle
particles
pathogen
pink
protein
red
research
rod
scenic
science
shape
shaped
sick
spikes
system
viral
virus