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.
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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