求翻译：和其它学科一样，经济学家首先提出理论，然后收集数据，验证理论。所以，经济学也是一门科学。但是，和其它科学不同，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？

And other disciplines, economists first proposed the theory, and then collect data to verify the theory. So, economics is a science. And other scientific, economists can not do controlled experiments in the laboratory, they can only rely on a natural experiment.

And other disciplines, an economist, first put forward theories and data collection, validation theory. Therefore, economics is a science. However, scientific, and other economists in the lab to do a controlled experiment, they can only rely on natural experiments.

Is same with other disciplines, the economist first advances the theory, then collection data, confirmation theory.Therefore, the economic also is a science.But, is different with other science, the economist is unable in the laboratory to do the controlled experiment, they only can depend upon the

As with other disciplines, an economist at first put forth the theory, and then gathers the data, verify that theory. So, economics is a science. But, unlike other sciences, economists can't do controlled experiments in a laboratory, they can only rely on natural experiments.

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