加权样本如果回复率相等，那么会提供有用信息的具有不同人口统计特征的个人。

The number of individuals in different demographic groups who would have provided usable information if response rates were equivalent. See sample weighting.

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如果这些信息您并不知道，那么确保抛出一个提供有用信息的异常，以便调用程序能够(但愿)做出类似的智能决策。

If that's not possible or not something you know, then make sure you bubble up an exception with helpful information so that calling programs can (hopefully) make similar smart decisions.

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这些相当大的区域中的每一个都包含交叉引用，以便进一步提供有用的词汇信息。

Each of these rather large areas contains cross-referencing in order to provide further helpful lexical information.

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