機器
abstract
bridge
building
bunch
closeup
construction
corrosion
crane
cylinder
depot
detail
diameter
engineering
equipment
factory
ferrous
gantry
girder
hardware
heap
heavy
hoist
hook
industrial
industry
iron
lift
load
machinery
macro
manufacture
manufacturing
material
metal
metallic
objects
overhead
pickup
pile
pipe
pipeline
plant
rod
rolled
round
rusty
stack
steel
stock
storage
storehouse
strength
technology
transportation
tube
unloading
warehouse
workshop