英文關鍵字
abandoned
background
bank
bottle
conservation
contamination
dirty
disposal
dump
ecology
environment
environmental
fight
flood
forest
garbage
heap
industry
junk
litter
littering
nature
nobody
outdoor
pile
plastic
pollute
polluted
pollution
pond
problem
recycle
recycling
resistance
river
rubbish
spring
trash
waste
water
wood