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