adding
asian
blue
boy
chemistry
chemistry class
child
classmate
classroom
closeup
controlling
discovery
education
eyeglasses
flask
glassware
gloves
goggles
hands
kid
knowledge
laboratory
learning
liquid
looking
mixing
physics
protective eyewear
pupil
reaction
reagent
red
research
rubber
school
school children
science
scientific experiment
scientist
smart
smoking
student
studying
teacher
testing
testtube
vietnamese
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