2. Taking Out
A. Extract (remove or separate) a "disturbing" part or property from an object, or
B. Extract only the necessary part or property.
Example:
• To frighten birds away from the airport, use a tape recorder to reproduce the sound known to excite birds (the sound is thus separated from the birds).
• Use a tape recording of a barking dog to deter burglars.
• Locate a noisy compressor outside the building where compressed air is used.
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