英文關鍵字
background
balance
bottles
cleaning
condition
contaminated
damage
danger
disaster
discarded
discharge
disposal
drainage
ecology
ecosystems
environment
environmental
flow
foam
garbage
global
green
industrial
lake
leak
liquid
mud
nature
odor
plant
plastics
pollution
production
protection
recycling
river
sanitation
sediment
sewage
smelly
source
stain
surface
system
technology
the
toxic
waste
water
white