機器
arc
assembly
automation
build
car
connect
construction
craftsman
equipment
fabricate
factory
fire
flash
industrial
industry
job
join
labor
laborer
light
making
man
manufacture
manufacturing
mask
metal
pipe
pipeline
polyethylene
production
protection
repair
safety
skill
skilled
smoke
spark
steel
structure
technical
technology
trained
weld
welded
welder
welding
work
worker
workplace