機器
enviroment
aerial
cargo
carriage
concrete
construction
development
dig
digger
dirt
dredge
dredging
drone
engineering
environmental
equipment
excavation
excavator
extraction
grain
gravel
ground
heap
heavy
hydraulic
industrial
industry
lake
loader
machinery
material
mechanism
mine
mineral
mining
sand
ship
shipping
technology
transportation
vehicle
vessel
water
work