機器
aerial
big
building
bulldozer
clear
construct
construction
development
dig
digger
dirt
duty
earth
engineering
equipment
excavation
excavator
gravel
ground
heavy
horizontal
hydraulic
industrial
industry
iron
isolated
land
machinery
metal
mine
mover
panoramic
piston
power
quarry
road
sand
scoop
scraper
shovel
site
sky
track
vehicle
work