adult
caucasian
chemical
chemistry
chemists
colleagues
coworkers
depression
doctor
examining
experiment
expertise
frozen
glasses
goggles
horizontal
hospital
hygiene
indoors
infected
lab
lab coats
laboratory
liquid nitrogen
magnification
man
mask
medical
medical masks
occupation
one person
people
personnel
profession
professional
protective
protective gloves
responsibility
safety
science
scientists
side view
skill
teamwork
uniform
woman
working
young