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Not only is aspirin so cheap it will not make any money for drug firms, it could be hard to find a group of women with breast cancer who were prepared never to take aspirin during a trial.

这不仅是因为阿司匹林的价格低廉，药物公司很难从它身上赚到钱，而且可能很难找到一群患有乳腺癌又愿意在试验期间准备从不服用阿司匹林的妇女。

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It's also hard to find much right with a drug that elevates blood pressure, aggravates stress, causes insomnia and leads to addiction.

同样，另一种药会导致血压升高、加剧紧张、造成失眠，而且最终会上瘾，你就很难说它有什么好处。

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It's hard to catch drug traffickers in Mexico,Cuellar says, and once they are caught "...to prosecute someone, at least when I was down there, was less than a 2 percent chance."

VOA: standard.2010.07.20

He said the findings would impact on drug policies, because they suggested reducing or eliminating the availability of cannabis would be "unlikely to make a dent" in the hard drug problem.

BBC: Cannabis 'not linked to harder drugs'

But, for all their willingness to make such experiments, the Swiss still clamp down hard on drug users and dealers.

ECONOMIST: Drugs in Switzerland

That country has a lower prevalence of hard-drug addicts per head (1.6 per 1, 000) than France (2.4), Britain (2.6), Italy (3.0) and Switzerland (5.0).

ECONOMIST: Going Dutch?