国境河a boundary river 关税是一个国家对于通过其国境的货物所课征的租税。they signed a treaty to lower duties on trade between their countries .
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The river forms a natural boundary between the two countries.
那条河在这两个国家之间形成一条自然边界。
A view from the river toward the site, showing how the project deals with many boundary conditions.
从河上看该地点，表现出该项目是如何处理众多的界限条件。
MM5 was employed to investigate the sensitivity of the simulation to the planetary boundary layer (PBL) parameterizations through the simulation of a rainstorm over the Yangtzi River Basin.
用MM5对长江流域的一次暴雨进行模拟考察其对行星边界层参数化的敏感性。
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