英文關鍵字
automatic
circular
construction
craftsman
cut
cutting
danger
disc
electric
engineering
equipment
factory
fire
flame
flash
grinder
hand
heat
hot
industrial
industry
iron
job
light
machine
man
manufacture
manufacturing
mask
metal
metalwork
power
production
protection
repair
safety
spark
sparks
steel
technical
technology
tool
tools
weld
welder
welding
wheel
work
worker
workshop