求翻译：第二类集中于中国ODI的贸易效应研究，但不同学者的研究结果不同。蔡锐和刘泉基于 “边际产业理论”，从中国对发达国家和对非发达国家投资两个视角，就中国对外直接投资的贸易效应进行了实证研究。结果表明，中国对发达国家的直接投资对于进口有一定的促进作用，但是作用不大，与出口的关系不显著；是什么意思？

The second category focused on the odi trade effects, but the results of different scholars. Cai Rui and Liu Quanji theory of "marginal industries, from two perspectives of the developed and the investment of non-developed countries, the trade effect of China's foreign direct investment, an empirica

The first 2 Classes focus on China's trade ODI behavoir, but different scholars of different results of the study. Mr Chua Jui and industry based on the "marginal" theory of developed countries, from China and the non-developed countries, and investment perspective on China's foreign direct investme

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Second class focused on the trade effects of Chinese ODI, but different scholars differ from the findings. Chua Jui Meng and Liu Quan is based on "theory of marginal industry", Chinese investment in developed and non-developed countries from the two perspectives on China trade effect of foreign dire

In second group in Chinese ODI trade effect research, but the different scholar's findings are different.Cai Rui and the Liu spring based on “the boundary industry theory”, invests two angles of view from China to the developed country and to the non-developed country, the Chinese foreign direct inv