“戴尔论证了这种现象的存在，他的理论听起来很有道理，”他说。

"He's demonstrated the phenomena exists and it's plausible," he said.

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排污权交易理论是由著名经济学家戴尔斯提出的。

The right trade theory was put forward by famous economist Dales.

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戴尔表示，一些最重要的观测结果是他在飞蝇钓时通过观察鸟类滑翔得到的，因此，当钓鱼活动结束后，他就带着要试验的新理论返回实验室了。

Dr. Dial says some of his most important observations have been made watching a bird glide by while he is fly fishing, and then heading back to the lab with a new theory to test.

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