A problem in using outdoor advertising is that of getting reliable data on the number of people who actually see an advertisement.

使用户外广告的一个问题是如何获得关于实际看到广告的人数的可靠数据。

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Reliable data, though, are scarce.

然而可靠的数据还是很少。

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There are no reliable data for Africa.

非洲并没有可靠的数据。

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For years,the lack of reliable data on HIV/AIDS in the Middle East and North Africa led regional governments to believe they had somehow managed to escape the epidemic.

VOA: standard.2010.07.07

Furthermore, our data is not always reliable.

再者，我们接收到的信息并不叫是正确的。

耶鲁公开课 - 心理学导论课程节选

The United Nations currently lacks reliable data for an accurate assessment of the problem.

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It is their attempt to push city officials to govern with reliable data, not just glossy posters.

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"We're starting to see parts of the specialist motoring press trying to produce reliable data, " says Mr Archer.

BBC: 'Carmakers manipulate emissions tests'