英文關鍵字
angle
automotive
blade
car
caucasian
circular
construction
cut
engine
engineering
equipment
factory
fire
fixing
grind
grinder
grinding
industrial
industry
ink
iron
job
man
manufacture
manufacturing
mechanic
metal
metallurgy
people
power
profession
protection
repair
repairman
safety
saw
service
spark
sparks
steel
technical
technician
tool
welder
welding
work
worker
workshop