英文關鍵字
circle
clean
cleaning
clip
dirty
environment
environmental
equipment
facility
filter
filtration
flow
footage
garbage
industrial
industry
motion
panorama
plant
pollution
pool
primary
production
pump
purification
radial
recycling
removal
reservoir
sanitary
sedimentation
settle
settling
sewage
sludge
smell
step
stink
storage
store
system
tank
tanks
technology
treatment
utility
view
waste
wastewater
water