機器
abrasive
blade
circle
corrund
cut
cutting
design
dirt
disc
drill
electric
engineering
equipment
factory
fittings
foreman
garbage
heat
human
industry
iron
labor
maintenance
material
metal
noise
operator
plant
precision
process
processing
production
protection
repair
rotation
safety
saw
shavings
spark
sparks
steel
technology
temperature
tool
welding
work
worker
workplace
workshop