Finally, this study results apply to the Shang (Zhou) Dan (Feng) circular economy industrial park transportation planning, logistics optimization model that has a certain practical and reasonable.

最后，将本文的研究成果运用到商(州)丹(凤)循环经济工业园区交通运输规划中，表明物流优化模型具有一定的实用性与合理性。

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Zhou Dan, graduated from English education department of Jishou University. Now she is teaching in Diligent education as an English teacher.

周丹老师，毕业于吉首大学英语教育专业，现任用心教育中心英语老师，小学部英语教研组教研主管。

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