英文關鍵字
arc
bright
brilliant
burning
caucasian
construction
craftsman
dark
engineering
equipment
factory
fire
flame
gas
hazardous
industrial
industry
iron
job
labor
light
manual
manufacturing
mechanic
mechanical
metal
metalwork
occupation
one
oxyacetylene
person
profession
repairing
safety
skilled
sparks
steel
technical
tool
tools
torch
welder
welding
work
worker