英文關鍵字
craftsmanship
construction
metalworking
engineering
fabrication
manufacture
industrial
technology
mechanical
equipment
metalwork
operation
technical
workshop
industry
grinding
circular
electric
grinder
cutting
factory
process
machine
worker
sparks
motion
manual
danger
metal
angle
steel
spark
power
wheel
sharp
cuts
tool
iron
slow
disk
work
heat
fly
cut
man