英文關鍵字
analyze
analyzing
blackboard
boy
checking
chemical
chemist
chemistry
child
childhood
class
classroom
clever
close
closeup
data
education
equipment
experiment
flask
fluid
formula
genius
kid
knowledge
lab
laboratory
learn
learning
lesson
liquid
little
mixing
observing
reaction
research
school
schoolboy
science
scientific
smart
student
study
studying
substance
test
tube
up
violet