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.
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.
同时，讨论了土体的孔隙水可自由流动和无渗流的情况，得到了一些有意义的结论。
Simultaneously, the cases in which porous water flows freely and does not seeps into soils are discussed and some very useful conclusions are obtained.
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