英文關鍵字
big
blasting
cement
concrete
constructions
crushed
dirt
dump
dumper
ecology
equipment
excavation
gray
heap
heavy
hopper
huge
industrial
industry
iron
large
limestone
machine
machinery
manufacture
metal
mine
mineral
mountain
open
opencast
ore
pit
production
quarry
raw
resource
rock
rocks
site
sky
stone
transport
transportation
truck
vehicle
vertical
work
yellow