Even in medicine, a randomised trial can only show whether the average patient benefits; not whether any individual patient will benefit.

即使在医学上，一个随机试验仅能证明普通对患者奏效，而不能证明个别患者会得益。

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A randomised study of 72 male and 73 female undergraduates found that those assigned to write about their relationship breakdown felt less tense and tired, and were less likely to succumb to colds.

对72名男性和73名女性本科生的随机研究发现，那些被要求写下其关系破裂事件的人会感到不那么紧张和疲惫，并且似乎不太受感冒的侵袭。

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The most reliable evidence comes from large human trials – preferably randomised trials in which the treatment is compared to a placebo.

最可靠的证据来自大型人体的试验- 最好是与服用安慰剂进行对比的随机治疗试验。

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"This is a randomised clinical trial which is the gold standard for producing evidence, " she added.

BBC: Patients wanted for maggots trial

The researchers at Harvard couldn't run a randomised controlled trial where half the participants ate burgers for two decades and the other half didn't, but they could use statistical techniques as the next best thing.

BBC: Red meat: What is a 13% increase in the risk of death?

We've learnt from the lessons of the Randomised Badger Culling Trial and turned it into a policy that can be delivered and gives us the benefits of culling in the long term.

BBC: Badgers back in the firing line