不过，他说，这个设施对生成环境影响的假设仍然具有重要的价值。

But he said the facility could still be valuable for generating hypotheses about environmental effects.

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但公允价值因与经济环境联系紧密，涉及诸多假设和不确定性等原因，在理论研究和实务应用中难度极大。

But fair value is close to the economic environment, which involves many reasons such as hypotheses and uncertainty etc, has many difficulties in study in the theory applied with practice.

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