英文關鍵字
bubbles
care
chemicals
contaminate
contamination
danger
decay
destroy
dirty
disease
dispose
drain
dump
dumping
ecology
environment
environmental
filthy
harmful
hazardous
health
industrial
industry
materials
neglect
outdoors
pipe
pollution
refuse
river
runoff
rusting
scum
seawall
sewer
sewerage
spread
toxic
unhealthy
unsafe
waste
water