While the predictions are often based on valid data, sometimes things change.

虽然这些预测都是通过大批调查数据得来的, 但是世事无常.

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It is imperative that all valid data also be immutable and stable.

所有有效的数据也必须是不可改变的和稳定的.

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Small collection of valid data can further enhance the effectiveness of online advertising.

通过直邮采集有效数据能进一步提升网络广告的效果.

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