機器
air
alloy
background
blue
bolts
box
brass
car
combustion
compression
compressor
compressors
cut
cutaway
cylinder
energy
engine
engineering
equipment
factory
gas
high
industrial
industry
line
machinery
manufacturing
mechanic
mechanical
metal
motor
nobody
nuts
object
oil
old
part
physical
pipe
piston
pressure
production
steel
technology
transportation
tube
turbine
valve
white
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