機器
anode
background
boiler
broken
calcium
cathode
cooper
corrosion
corrosive
curl
damage
dirt
dirty
domestic
electric
element
engineering
equipment
failure
grunge
heat
heater
hot
iron
isolated
magnesium
magnesium anode
metal
mineral
object
obsolete
old
part
repair
rust
rusty
scale
scrap
scum
sediment
service
spiral
stainless
stone
tubular
unhygienic
water
white