機器
asphalt
background
bulldozer
bundle
caution
cement
city
collection
concrete
constructing
construction
cover
drilling
engineer
flat
highway
horizontal
illustration
industrial
industry
job
labor
loader
machinery
maintenance
male
man
occupation
profession
public
repair
repairman
road
roadwork
safety
service
set
sing
site
staff
town
traffic
transportation
uniform
warning
work
worker
workman