英文關鍵字
bitumen
bituminous
blowtorch
builder
building
burner
burning
coating
construction
contractor
cover
covering
equipment
felt
fire
flame
flexible
floor
fuel
gas
heating
industrial
industry
insulation
maintenance
man
material
melt
melting
motion
propane
protection
recovering
renovate
renovation
repair
roll
roof
roofer
roofing
ruberoid
slow
surface
tar
technology
torch
waterproof
weld
work
worker