英文關鍵字
air
assemblage
assemble
assembling
assembly
billet
bolt
clamping
conveyor
detail
enterprise
equipment
factory
hand
hands
holding
human
impact
industrial
industry
labor
manual
manufacture
manufacturing
mechanical
mechanician
metal
metallic
nut
people
plant
pneumatic
thread
tighten
tightening
tool
unit
units
work
worker
workshop
wrench