機器
acetylene
black
bright
closeup
construction
cut
danger
dangerous
energy
engineering
equipment
factory
fire
flame
frame
gas
grow
hard
head
heat
hot
industrial
industry
iron
job
light
manufacturing
metal
metalwork
oxyfuel
oxygen
pipe
plant
plate
professional
protection
red
repair
rust
safety
sheet
smoke
spark
steel
technology
torch
welding
work
worker