controlled experiment

基本解釋

We can’t know for sure because this is not a controlled experiment.
我們不能確定，因爲(wèi)這不是一個可控實騐。
Vicente conducted a randomized, controlled experiment on electoral bribery in S?o Tomé and Príncipe.
文森特在某非洲小國做了一項關(guān)於“賄選”的實騐。
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).
歷史是一個不受控制的試騐，我們不能確切地知道如果沒有最高法院的判決（或其它與之有關(guān)的任何事件）將會發(fā)生什麼。

Researchers adjusted their computer algorithm to the slower insulin absorption rate and on a repeat experiment blood glucose was tightly controlled in all of the subjects.

Indeed, it is why many early medical advances became standard of care without anyone seeing the need for a placebo controlled experiment.
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Whatever the mechanism, though, this study provides what no previous study ever has: evidence from a controlled experiment that keystone species really exist.
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