機器
air
aircraft
airplane
aviation
background
blade
closeup
condition
conditioner
conditioning
cool
cooler
cooling
danger
design
electric
engine
engineering
environment
equipment
factory
fan
industrial
industry
jet
large
mechanical
metal
motor
plane
power
red
rotate
rotating
rotor
round
stainless
steel
system
technology
texture
transportation
turbine
ventilate
ventilation
ventilator
wall
white
wind