機器
aerial
arm
cement
cloud
coal
construction
construction site
development
dirt
dirty
dump
earth
energy
environment
equipment
excavator
fill
gold
heavy
hydraulics
industrial
industry
iron
landfill
landscape
load
machinery
metal
mine
open
opencast
operator
people
pollution
production
quarry
rock
site
slate
speed
technology
tractor
transport
transportation
truck
vehicle
wheel
working