英文關鍵字
analysis
analyzing
awareness
biodegradable
biological
bottle
cleanup
computer
conservation
contamination
control
crisis
earth
ecological
ecologist
ecology
electronic
environment
environmental
explore
forest
garbage
landfill
man
nature
planet
plastic
poisonous
pollute
pollution
problems
protective
record
recycle
recycling
reduce
research
resources
responsibility
scientist
singleuse
social
studies
suit
tablet
test
toxic
trash
typing
waste