We can't know for sure because this is not a controlled experiment.
我们不能确定，因为这不是一个可控实验。
And in a controlled experiment on hiring decisions, male leaders were not penalized for choosing a woman or nonwhite candidate over an equally qualified white man.
此外，一项关于招聘决策的受控实验显示，男性领导者如果选择了女性或非白人候选人，而非具有同等资历的白人男性，并不会因此受到惩罚。
She thinks that designing a controlled experiment will give researchers a better understanding of the factors affecting IVF outcome, rather than just analyzing statistics.
她认为，设计一项对照试验与仅仅分析统计数据相比，将更有助于研究人员了解影响IVF成功率的因素。
DESIGN: a controlled experiment was conducted on the basis of clinical diagnosis.
设计：以诊断为依据设立对照的实验研究。
History is not a controlled experiment and so we cannot know exactly what would have happened absent a particular Supreme Court decision (or any other event for that matter).
历史是一个不受控制的试验，我们不能确切地知道如果没有最高法院的判决(或其它与之有关的任何事件)将会发生什么。
History is not a controlled experiment and so we cannot know exactly what would have happened absent a particular Supreme Court decision (or any other event for that matter).
历史是一个不受控制的试验，我们不能确切地知道如果没有最高法院的判决(或其它与之有关的任何事件)将会发生什么。
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