英文關鍵字
blade
circle
construction
cut
cutting
disc
electric
electrical
engineering
equipment
factory
fire
flash
flying
gloves
grinder
grinding
hand
heavy
industrial
industry
iron
job
labor
laborer
machine
man
manual
manufacture
manufacturing
mechanical
metal
pipe
power
production
protection
round
safety
spark
sparkle
speed
spin
steel
structure
technical
tool
welding
work
worker
workshop