英文關鍵字
and
auger
borer
business
cargo
construction
constructions
crane
detail
device
drill
drilling
electrical
equipment
factory
hard
heavy
hole
industry
instrument
iron
job
large
machine
machinery
magnetic
manufacture
mechanism
metal
metalwork
movement
object
outside
process
rotation
shaving
spiral
steel
structures
surface
thread
tool
worker
works
workshop