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2016-02-19T13:18:42+08:00
2016-02-19T14:15:55+08:00

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A whistle is a device that produces sound when air is forced via an opening. They are very simple looking devices or they are mechanical whistle devices and can be made by plastic or metal. A whistle can take into variety of forms as long as it has an opening for the air to enter and another hole as the exit with a small ball inside giving the whistle a high tone.
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