英文關鍵字
burn
burning
construction
cut
cutting
danger
engineering
equipment
factory
fire
flame
foundry
gas
hand
heat
heating
industrial
industry
instrument
iron
machine
machinery
machining
man
manufacture
manufacturing
melt
melting
melts
metal
metalwork
oxygen
people
pieces
plasma
pressure
production
safety
skill
spark
steel
structure
technology
tool
torch
weld
welder
welding
work
worker
working
workshop