英文關鍵字
background
bottle
bottles
chemical
clean
concept
contamination
danger
design
dirty
disaster
dump
ecological
ecology
environment
environmental
factory
flat
floating
flow
garbage
green
illustration
industrial
industry
lake
left
litter
marine
nature
ocean
pipe
plant
plastic
pollute
polluted
pollution
problem
protection
recycle
right
river
rubbish
sea
sewage
sides
sky
toxic
trash
trees
tube
unhygienic
urban
vector
wall
waste
water
wild