英文關鍵字
business
calcareous
carboniferous
concrete
crush
crusher
deposit
destruction
development
dig
equipment
excavate
extraction
geology
heavy
industrial
industry
large
limestone
machine
machinery
manufacturing
material
mechanism
mine
mineral
mining
natural
nature
outdoor
pile
powerful
quarry
resource
rich
rock
rotative
rough
sedimentary
stockpile
surface
technology
wall
white
work