它完好無損的時候,尚且不能用來製造工具,被火燒後豈不更沒用了嗎?

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Even when it is whole
    it cannot be used for anything;
So when fire has devoured and charred it,
    how useful can it be?

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If it was not useful for anything when it was whole, how much less can it be made into something useful when the fire has burned it and it is charred?

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