引力模型作为解释双边贸易流向和流量问题的有力的分析工具，已经在国际贸易实证研究中获得了相当的成功。
Gravity model is a good tool to explain the direction and flow of bilateral trade, and has gained success on the empirical research in international trade.
通过应用引力模型的研究发现，各国制度的优劣对双边贸易有显著的影响，制度相似的国家间贸易量较大。
The research via gravity model shows that the system quality of each country will impact bilateral trade effectively, and the trade flow is large between the countries with similar systems.
通过应用引力模型的研究发现，各国制度的优劣对双边贸易有显著的影响，制度相似的国家间贸易量较大。
The research via gravity model shows that the system quality of each country will impact bilateral trade effectively, and the trade flow is large between the countries with similar systems.
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