以前，大陆之间的鸿沟允许水自由流动；而现在地峡形成了一道屏障，把大西洋和太平洋分隔开来。
While previously the gap between the continents had allowed a free flow of water, now the isthmus presented a barrier that divided the Atlantic Ocean from the Pacific Ocean.
地峡的形成对全球洋流格局产生了重要的影响。
The formation of the isthmus had important consequences for global patterns of ocean water flow.
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