機器
environmental
aqua
blue
brown
building
clearing
construction
crane
day
digger
dirt
dredge
dredger
earth
effluent
equipment
excavator
flood
freight
heap
heaven
industrial
industry
land
loading
machinery
material
mine
nature
palate
pile
pit
river
sand
shovel
sky
soil
stack
stream
transport
transportation
vacuity
water
working