英文關鍵字
analysis
analyzing
biology
blackboard
boy
chemical
chemist
chemistry
child
childhood
class
classroom
clever
close
closeup
education
equipment
experiment
flask
fluid
formula
kid
know
knowledge
lab
laboratory
learning
lesson
liquid
little
looking
medicine
research
school
schoolboy
science
scientific
scientist
smart
smile
smiling
student
study
studying
technology
test
testing
tube
up