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.

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。

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The cave narrowed after a while, but we were able to continue through a narrow gap by crawling into a water-filled fissure in the rock.

爬了不久，山洞变得越来越窄，爬过一条满是水的岩石裂缝，穿过狭窄的山口，我们得以继续前行。

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I noticed this unique leave while taking a walk at Delaware Water Gap.

我在特拉华水峡(Delaware Water Gap)时，注意到这个独特的叶片。

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McKinsey estimated that by 2030, there will be a 40% gap between global water supply and demand.

FORBES: World Water Day 2013: Water as a Catalyst for Peace

Northern and Southern trees meet peacefully at the Delaware Water Gap National Recreation Area, a National Park Service area that includes the states of New Jersey and Pennsylvania.

CNN: When autumn leaves fall

But that, it says, opened up a gap with the earthen base and the water rushed down into the gap.

NPR: Panel's Report Assigns No Blame in Levee Failures