英文關鍵字
absorber
assembly
auto
automatic
black
component
detail
engineering
equipment
factory
fix
hammer
hammering
hand
heavy
industrial
industry
iron
job
machine
machinery
machining
man
manufacture
manufacturing
material
mechanical
mechanics
metal
metallic
metalwork
modern
new
object
plant
process
processing
shock
spiral
spring
springs
springy
steel
suspension
technology