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