英文關鍵字
arc
asian
background
bright
construction
cutting
danger
dark
electric
energy
engineer
equipment
explore
factory
fire
firefighter
flame
grinder
hand
helmet
hot
industrial
industry
iron
job
light
machine
manufacturing
metal
metalwork
occupation
old
power
production
protect
safety
skill
spark
steel
technical
tool
weld
welder
welding
work
worker