英文關鍵字
abstract
art
background
brown
chemical
color
contaminated
contamination
damage
danger
dirt
dirty
disaster
dump
ecology
environment
environmental
float
garbage
global
grunge
industrial
lake
liquid
natural
nature
oil
oily
pattern
petroleum
polluted
pollution
pond
problem
river
rubbish
sea
sewage
smell
stain
surface
texture
textured
toxic
trash
unhygienic
wallpaper
waste
water
yellow