機器
arc
blue
construction
craftsman
engineering
factory
fire
flame
heat
helmet
hot
industrial
industry
iron
job
labor
laborer
light
man
manual
manufacture
manufacturing
mask
metal
occupation
protection
repair
safety
skill
skilled
smoke
spark
steel
tech
technical
technology
tool
torch
trained
weld
welded
welding
work
worker
workforce
workplace