英文關鍵字
aged
appliance
blue
boiler
central
cuisine
design
domestic
efficiency
energy
engineer
equipment
fire
fireplace
fuel
gas
heat
heater
heating
home
hot
household
indoor
industry
interior
kitchen
machine
maintenance
metal
old
pipe
piping
plumbing
replacement
room
rust
rusty
saving
steam
tank
technology
temperature
utility
vintage
water
yellow