英文關鍵字
burner
construct
construction
craftsman
equipment
fire
fix
flame
freight
glasses
hard
industrial
industry
install
iron
job
join
maintain
maintenance
man
metal
metallurgy
metalwork
outdoor
people
person
protection
public
rail
railroad
railway
repair
safety
shine
smoke
spark
station
steel
steelwork
torch
train
transportation
weld
welded
welder
welding
work
worker
workman
workplace