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。
A problem in using outdoor advertising is that of getting reliable data on the number of people who actually see an advertisement.
恰巧的是追踪他们净就业情况的可靠数据很缺乏。
Unfortunately, reliable data that tracks their net employment performance is scarce.
我们不清楚他的观点有多可信，因为他自己也曾抱怨过可靠数据不足。
It is not clear how solid the idea was, since he himself complained about the lack of good data.
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