英文關鍵字
adult
bottle
bowl
boy
caucasian
caution
chemical
chemist
chemistry
child
childhood
clever
coat
discovery
education
equipment
experience
experiment
eyeglasses
female
give
holding
indoors
instruction
invention
laboratory
male
people
preparation
prepare
professional
protective
reagent
regulations
research
researching
safety
schoolboy
science
scientist
study
talking
together
woman
work
worker