Opens, closes the CD / DVD tray, disc read:
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Shutting, Turning on the laptop, fan noise
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Franking machine
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Photocopy (photocopy)
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Modem connection, signal, interference
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Typewriter, environmental sounds, Office work
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Room noise, write, read, Hard disk
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Insert the disk into the drive, read the
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Computer simulated laser
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Signal read information, Computer interface
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Turn off the old monitor, Turn on
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Computer mouse movement
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Computer interface, signals
★★★★★