表皮
analysis
antiseptic
bacterium
clean
clinic
clinics office
closeup
dirt
flora
hand
health
health care
healthy
hospital
infection
infection control
infectious
laboratory
liquid
manipulation
medical
microbe
modern
operation
prevention
private
procedure
process
professional
progress
protection
protective
safety
session
skin
special
stainless
steel
sterility
sterilization
surface
tap
vial
wash
water
woman