英文關鍵字
angle
circular
construction
craftsman
cut
danger
electric
engineering
equipment
factory
fire
flash
gloves
grinder
grinding
hand
heat
industrial
industry
iron
job
labor
light
machine
man
manual
manufacture
manufacturing
men
metal
people
person
power
production
protection
protective
safety
skill
spark
steel
structure
technical
technology
tool
welder
welding
wheel
work
worker
workshop