機器
access
confined
construction
cover
danger
dark
detail
dirty
economy
energy
engineering
entry
environment
equipment
flow
fuel
grunge
heat
hole
industrial
industry
iron
line
manhole
metal
metallic
oil
old
open
plate
power
rusty
safety
sand
space
steel
storage
surface
tank
technology
texture
tool
tunnel
urban
ventilation
vessel
water
work