随机对照试验
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a randomised controlled trial
一项随机对照试验
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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?
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