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.

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流动使水充满活力和自由(流水不腐)。

Water remains alive and free by flowing.

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但是人们发现就餐时喝点水的确有好处，水可以使胃的消化液更加自由地流动，这有助于消化食物。

It makes the digestive juices flow more freely and helps to digest the food.

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