英文關鍵字
rock
jackhammer
pneumatic
destruction
site
industry
hydraulic
heavy
hammer
ground
power
quarry
equipment
pipe
trench
excavator
backhoe
scoop
shovel
bulldozer
construction
tractor
dig
excavation
dirt
work
machine
industrial
pit
outdoors
mover
dust
activity
breaker
demolish
dismantling
destroy
land
demolition
huge
compression
crushing
mining
smashing