英文關鍵字
cleaning
closeup
container
dirty
drain
drainage
emergency
equipment
faeces
fecal
feces
handheld
hole
hose
industrial
industry
lid
liquid
maintenance
manhole
material
nature
off
pipe
pump
pumping
removal
secure
service
sewage
sewer
sewerage
shit
smell
stink
stoppage
street
suck
suction
tank
toilet
transport
treatment
waste
water
waterdrain
well
work