The programmer has to make sure that tags are properly closed and nested.

编程人员必须保证标签是正确关闭和嵌套的。

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At least one column must be a key in each mining model and nested table.

在每个挖掘模型和嵌套表中，必须至少有一列是键。

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At least one column must be a key in each mining model and nested table.

在每个挖掘模型和嵌套表中，必须至少有一列是键。

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