That would need randomised controlled trials, in which one group wore masks and the other did not.

这需要随机对照实，一组戴口罩，另一组不戴。

We discovered that this control experiment, which was obligatory in order to gain approval, never took place.

我们发现，这个为了获得批准而必须对照实从未发生过。

We need more comprehensive, controlled trials with plenty of subjects before we can come to any real conclusions.

我们需要研究主题足够多更全面对照实，在得出任何真实结论之前。

The study was not a controlled experiment designed to prove whether or how texting or other activities might cause crashes.

该研究不是旨在证明发短信或其它活动是否或如何导致车祸对照实。

D. Controlled experiments on wrens and other birds.

D. 鹪鹩和其他鸟类对照实。

I mean, if you remember, this isn't a controlled experiment.

如果你还记得话， 这不是一个对照实。

A non-smoking control group was recruited from the general population.

他们从普通群体中招募了一支不抽烟实对照组。

Equivalent numbers of each type continued to be given ordinary water as a control.

作为实对照，让每种类型中相同数量老鼠继续饮用普通水。

The new hypothesis needs to be tested with a new controlled experiment.

新假设需要用一个新对照实来检。

The other two conditions were controls, where subjects only did either slow eccentric or fast eccentric training.

另外两组是对照组，实对象只慢离心训练和快离心训练。

Seven of the 23 acted as a control group, and received no intervention from Dr Bolli after the surgery.

23人中7人为实对照，术后未接受Bolli博士实操作。

The remaining two experiments were controls, one with and one without a placebo.

剩下两个实是对照组，一组使用安慰剂，另一组不使用安慰剂。

We have the first early results on productivity from these tools and one is a controlled experiment that was done with people writing business writing.

我们得出了这些工具首个生产力结果，其中一个是让人们写商业文章对照实。

Scientists have only recently started carefully testing Thayer's century old idea in controlled experiments to see if it's really as universal as he claimed.

科学家们直到最近才开始在对照实中仔细证塞耶一个世纪前想法，看看它是否真像他声称那样普遍。

One drawback with the studies is that they are all retrospective, looking back at naturally occurring data rather than randomised-controlled experiments.

这些研究一个缺点是它们都是回顾性，回顾自然发生数据而不是随机对照实。

In it, social scientists randomly assigned low-income families into a control group or one of two experimental groups.

其中，社会科学家将低收入家庭随机分配到对照组或两个实组之一。

A team of researchers from the University of New York conducted a randomized control trial with 691 depressed patients from 83 physician practices across England.

来自纽约大学研究团队在英格兰全境 83 名医生 691 名抑郁症病人上了随机对照实。

And without the herbivore effect in the model-so in the control run-we found that only 50 percent of the permafrost area would remain by the year 2100.

如果模拟中没有食草动物影响，即在对照实组中，我们发现到2100年，只有50%永久冻土区能保留下来。

Archival voice: Celluloid, one of the earliest of plastics… Conservators also have turned to controlled experiments to get a grasp on how plastic artifacts degrade.

档案声音：赛璐珞，最早塑料之一… … 保护人员也转向对照实来了解塑料制品是如何降解。

The current study was not a controlled experiment designed to prove how the amount or type of protein people eat might directly affect the length of their lives.

目前研究并不是一个旨在证明人们摄入蛋白质数量或类型如何直接影响其寿命对照实。