英文關鍵字
building
busy
clothes
construction
craft
craftsmen
electric
engineering
equipment
fabricator
facilities
factory
fire
foundry
gas
ground
hands
head
industrial
industry
labor
laborer
laboring
machinist
manufacturing
mask
metal
occupation
pipe
protection
protective
safety
skill
sparks
technology
tool
torch
tube
welder
welding
worker
working