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关注：1
2013-05-23 12:21
求翻译：经济学家无法在实验室做受控实验，他们只能依靠自然试验是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
经济学家无法在实验室做受控实验，他们只能依靠自然试验
问题补充： |
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2013-05-23 12:21:38
Economists can not do controlled experiments in the laboratory, they can only rely on the natural experiment
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2013-05-23 12:23:18
Economists do not in the lab to do a controlled experiment, they can only rely on natural test
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2013-05-23 12:24:58
The economist is unable in the laboratory to do the controlled experiment, they only can depend upon the nature experiment
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2013-05-23 12:26:38
Economists can't do controlled experiments in a laboratory, they can only rely on natural experiments
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2013-05-23 12:28:18
正在翻译，请等待...
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