英文關鍵字
wheel
settle
turning
technology
water
settler
filtration
sedimentation
panorama
tire
basin
pool
reservoir
waste
steel
grid
flow
dirty
filter
industrial
round
circle
environmental
plant
pollution
purification
recycling
tank
treatment
ecology
sludge
wastewater
effluent
chemical
cleaner
green
concrete
engineering
facility
landscape
liquid
municipal
processing
environment
sewer
establishing
spin