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Text 2 Centuries ago, man discovered that removing moisture from food helps to preserve ...

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was understood centuries before this time  was described by an Indian writer about 2300 years ago  is met in many countries today  is carried out in forests as well as in national parks  
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date back    date back to    dates from    date to  
a; the    the; 不填    不填; the    the; the  
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