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So, we can say for sure that they work better than the dummy treatment, but not whether one product works better than another.

因此，我们可以肯定地说，它们比虚拟疗法更有效，但决不是说一个产品比另一个产品更有效。

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Previous research has compared a product or pill with a placebo (a dummy treatment) rather than other smoking cessation products.

以前的研究是将一个产品或药物和安慰剂(一种虚拟疗法)相比较，而不是比较其它戒烟产品。

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But in bigger babies, it reduced the risk of lung damage to 50%, from 69% in the dummy treatment group.

BBC: NEWS | Health | Relaxant 'helps premature babies'

The Phase III trial will compare TroVax plus standard kidney cancer treatment and a dummy version plus standard treatment.

BBC: Vaccine 'tackles kidney cancer'