機器
acetylene
construction
constructor
copper
cut
cutter
cutting
equipment
flame
gas
gear
glasses
gloves
hot
industrial
industry
iron
laborer
machinist
man
manual
material
melting
metal
metalwork
oxy
oxyacetylene
oxygen
pipe
profession
repair
safety
site
spark
sparks
steel
technology
tool
torch
uniform
valve
welder
welding
work
worker
workshop
workwear