英文關鍵字
blocked
boots
cleaner
cleaning
closeup
dirty
drain
drainage
emergency
equipment
faeces
fecal
feces
full
hole
hose
industrial
industry
leg
maintenance
manhole
men
off
people
pipe
pipeline
professional
public
pump
removal
repair
sanitary
service
sewage
sewer
sewerage
shit
shoes
specialist
spill
stoppage
street
system
tank
uniform
water
well
work
worker