英文關鍵字
clean
clear
concrete
corroded
corrosion
drain
ecology
environment
flowing
from
ground
industrial
industry
moving
nature
old
pipe
pollution
pump
river
rust
rusty
splash
station
steel
substance
tile
treatment
tube
waste
water
英文關鍵字
clean
clear
concrete
corroded
corrosion
drain
ecology
environment
flowing
from
ground
industrial
industry
moving
nature
old
pipe
pollution
pump
river
rust
rusty
splash
station
steel
substance
tile
treatment
tube
waste
water