英文關鍵字
construction
cutting
employment
equipment
factory
grinder
grinding
heat
industry
iron
line
machine
machinery
manual
manufacturing
metal
power
protective
rod
safety
sparks
steel
tool
turning
vise
wheel
work
worker
working
workshop
英文關鍵字
construction
cutting
employment
equipment
factory
grinder
grinding
heat
industry
iron
line
machine
machinery
manual
manufacturing
metal
power
protective
rod
safety
sparks
steel
tool
turning
vise
wheel
work
worker
working
workshop