英文關鍵字
chemistry
child
childhood
children
class
closeup
cute
educated
education
elementary
energy
enthusiasm
experience
experiment
experimenting
flask
individually
kids
laboratory
learning
lesson
liquid
modern
note
people
primary
recording
research
results
school
schoolboy
schoolgirl
science
scientific
smart
student
study
teaching
test
tube
working
young
youthful