機器
action
building
bulldozer
business
car
civilization
commercial
concern
construction
country
digging
dirt
dust
earth
earthwork
earthworks
engineering
equipment
establishment
extreme
firm
geodesy
grader
ground
hard
highway
industrial
instruments
mechanism
mechanization
military
offroad
old
outdoor
outline
poland
power
site
soviet
spadework
stripper
strong
structure
sunshine
technology
terrain
transport
vehicle
work