機器
activity
belt
cement
cobblestone
construction
conveyor
dig
dirt
earth
engineering
environment
equipment
excavate
excavation
excavator
factory
gravel
ground
heap
heavy
hydraulic
industrial
industry
land
large
machinery
manufacturing
material
mine
mineral
open
outdoors
pit
plant
power
quarry
rock
sand
sky
soil
stack
steel
stone
transport
transportation
vehicle
work
yellow