英文關鍵字
acid
analyzing
biohazard
carbon
chemicals
climate
close
closeup
co2
conceptual
contamination
danger
dioxide
disaster
earth
ecological
ecology
ecosystem
environment
environmental
forest
global
hazard
hazardous
herbicide
impact
industrial
leaves
nature
nuclear
pesticide
planet
poison
pollution
problems
protective
radiation
rain
rainforest
recycle
scientist
studies
suit
test
toxic
trees
up
warming
waste