鸽子洞原理是分析数学组合的有力工具。但是其概念简单，可以通过以下具体的问题加以阐述。

The pigeonhole principle is a powerful tool used in combinatorial math. But the idea is simple and can be explained by the following peculiar problem.

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文章首先从FDI所面对的实际税率和税收优惠措施的效果两方面对此加以分析阐述，然后依此分析了我国涉外税收政策中存在的问题，并相应提出了自己的建议。

This paper analyses the effective tax rate and the effect of the favorable policy, and then puts forward a suggestion concerning China's taxation policy on FDI.

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然后，文章从道德、权利义务对等、经济学等角度加以分析，阐述了我国确立拾得遗失物报酬请求权的可行性和必要性。

Then , this paper analyze on the aspects of morals , rights, economics and so on , expounds the feasibility and necessity of establishing reward request right of picking up the lost article.

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