機器
assembly
beams
close up
connect
construction
engineering
equipment
fabricate
factory
fire
flash
gas
gloves
hand
heat
heavy
helmet
hold
industrial
industry
iron
job
join
labor
laborer
lift
light
machinery
man
manufacture
manufacturing
mask
metal
protection
repair
safety
skill
smoke
spark
steel
structure
technical
technology
welded
welder
welding
work
worker
workplace