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Measuring the success of public health campaigns is often hard enough.

衡量公共卫生运动的成功往往具有足够难度。

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While all this was going on in public, we were struggling hard with some big questions.

正当公众关注这所有一切的时候，我们正在努力处理一些大问题。

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But analysts say public transport is hard to police.

VOA: standard.2010.04.01

So I think the police service has the responsibility to involve us in that discussion and we as the public, as parliamentarians,have a responsibility to respond intelligently to that and be realistic about the hard choices that are made,"

VOA: standard.2009.04.21

Dr. KESSLER: This is as hard a public health challenge as we've ever tackled.

NPR: Nation's Obesity Problem Puts Strain On Health Care Costs

Fil-Estate had lobbied hard for public support, with full-page newspaper ads claiming the site would be an environmental and ecological showcase.

CNN: A novice senator finds a new cause to fight for

That makes it hard for public companies to compete against private-equity buyers.

ECONOMIST: Media firms and private equity