機器
activity
architecture
armature
background
black
build
business
carcass
city
color
construction
contractor
crane
dawn
dusk
elevator equipment
engineering
equipment
frame
heavy
high
house
industry
job
light
machinery
metal
metallic
modern
outdoor
people
power
rod
scoop
silhouette
site
skyscraper
steel
sunset
technology
work
worker
working
workplace