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.

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。

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Objective To establish the method to assess mathematically the compensation of flow in bilateral vertebralartery(BVA).

目的建立定量描述双侧椎动脉血流代偿性的方法。

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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。

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As the economy recovers, the country should move forward to realize bilateral and regional agreements, enhancing the international flow of goods, services and capital.

WSJ: Lloyd Blankfein: The Business Plan for American Revival

The transfer of advanced U.S. technology and arrangements for some "flow-back" of Japanese innovations were authorized by a bilateral agreement between the two governments concluded in November 1988 after years of negotiation.

CENTERFORSECURITYPOLICY: The US-Japan FS-X Fighter Agreement: Assessing The Stakes