Study the theoretics foundations of the development of vacation tourism product of forest parks and summarize interrelated researches.

研究整理了森林公园度假旅游产品开发的理论基础和相关研究成果。

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Study of this paper may supply theoretics of lunar probe trajectory for our nation, also provide supports and references for our lunar exploration project.

本论文的研究可以进一步丰富我国在月球探测器轨道方面的理论，同时为我国的月球探测工程在理论上提供一定的支持与参考。

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These factors interact and affect mental health of teenagers. Mental health problem of teenagers and study about it, is regarded as a focus in theoretics of education and psychology.

造成这些心理问题的因素是多样的，具体体现在家庭、学校、社会及个体四个方面，这些因素相互作用，共同影响着青少年的心理健康。

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