機器
aerial
barge
blue
boat
bottom
business
cargo
construction
crane
crushed stone
digger
dredge
dredger
engineering
equipment
excavation
excavator
extraction
extracts
forest
geology
gravel
industrial
industry
lake
landscape
machinery
middle
mine
mineral
minerals
pit
plant
quarry
river
sand
sea
ship
shore
suction
technology
transport
transportation
vacation
vessel
water
work