英文關鍵字
rubber
valve
handle
manual
tool
mechanical
cleaning
blockages
sewer
pipes
removal
air
preventing
movement
clean
clog
plumbing
dirty
work
clogged
waste
bath
bathroom
domestic
home
hygiene
pipe
plumber
plunger
emergency
flood
hands
help
toilet
water
drains
sink
drain
blockage
removed