機器
boiler
broken
calcium
corrosion
crack
damage
detail
dirt
dirty
domestic
electric
element
equipment
failure
heat
heater
hot
incrustation
iron
isolated
laundry
lime
metal
mineral
obsolete
old
problem
repair
rust
rusty
scale
scrap
scum
sediment
service
spiral
stainless
steel
technology
unhygienic
washer
waste
water
white