英文關鍵字
arc
bright
construction
craftsman
electric
engineering
equipment
fabricate
factory
flame
flash
helmet
hot
improvisation
industrial
industry
iron
job
labor
laborer
light
machine
making
man
manufacture
manufacturing
mask
mechanic
melt
men
metal
prefabricate
production
protection
repair
safety
skill
skilled
smoke
spark
steel
steelmaking
technical
technology
tool
tools
weld
welded
welder
welding
work
worker
workplace