英文關鍵字
analysis
analyzing
chemicals
close
closeup
contamination
danger
dangerous
earth
ecological
ecology
environment
environmental
global
hazard
hazardous
hold
hydrogen
insecticide
lab
laboratory
liquid
metals
pesticide
petroleum
plastic
poison
poisonous
pollute
pollution
problems
recycle
research
sample
scientist
studies
symbol
test
testing
toxic
toxicology
tube
up
warning
waste
water
woman
work
world