英文關鍵字
big
car
carrying
cast
coal
construction
delivery
dig
driver
dump
earth
ecology
engineering
environment
equipment
excavation
excavator
geology
gravel
heavy
industrial
industry
iron
landscape
machine
machinery
metal
mine
mineral
mining
open
ore
pit
power
production
quarry
riding
road
rock
site
stone
technology
transport
transportation
truck
vehicle
work
worker