任何能提供有用信息的人应该联系警方。
Anyone who can provide useful information should contact the police.
真实的广告提供有用信息帮助顾客来决定他们是否想要或需要被广告的商品。
Truthful ads provide good information that helps customers to decide whether they want or need the advertised product.
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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