英文關鍵字
danger
dirty
dump
environment
factory
flowing
garbage
industry
pipe
pollution
rust
rusty
sewage
sewer
smell
substance
toxic
unhygienic
unpleasant
waste
water
英文關鍵字
danger
dirty
dump
environment
factory
flowing
garbage
industry
pipe
pollution
rust
rusty
sewage
sewer
smell
substance
toxic
unhygienic
unpleasant
waste
water