機器
abstract
architecture
background
building
business
concrete
construction
design
dirty
energy
engineering
environment
equipment
factory
floor
indoor
industrial
industry
inside
interior
iron
labor
large
machinery
manufacture
manufacturing
metal
old
perspective
pipe
power
production
rise
road
room
space
stair
staircase
stairway
steel
step
structure
supply
technology
up
vertical
way
work