英文關鍵字
arm
axle
boring
cables
construction
cylindrical
dirt
drill
drilling
equipment
gravel
heavy
hydraulic
industrial
industry
machine
machinery
metallic
piston
pylon
rotating
specialized
spinning
technology
tube
with
working
英文關鍵字
arm
axle
boring
cables
construction
cylindrical
dirt
drill
drilling
equipment
gravel
heavy
hydraulic
industrial
industry
machine
machinery
metallic
piston
pylon
rotating
specialized
spinning
technology
tube
with
working