英文關鍵字
angle
blade
circle
closeup
construction
cut
danger
disc
disk
electric
electrical
equipment
flame
garage
grind
grinder
hand
heat
hot
industrial
instrument
iron
job
light
machine
manual
manufacture
manufacturing
metal
part
production
profession
protection
repairman
rotate
seam
service
spark
sparks
speed
steel
stripping
technology
tool
welding
wheel
worker
workshop