英文關鍵字
city
clean
cleaning
container
dirty
drain
dump
emergency
emptying
environment
equipment
europe
european
faeces
fecal
feces
foot
hole
hose
industrial
industry
maintenance
manhole
nature
people
pipe
power
protection
pump
removal
service
sewage
sewer
sewerage
shit
specialist
stoppage
street
technology
transportation
treatment
union
urban
vehicle
water
waterdrain
well
work
worker