求翻译：请输入您需A bag is useful and the word “bag” is useful, too. It gives us some interesting phrases(短语).One is “to let the cat out of the bag\" It is the same as “to tell the secret”. There is an old interesting story about it.　　Long ago, when people sold things in big cloth(布)bags, a woman asked a man for a pig. The man held是什么意思？

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