The sea romance disappears once the land is down below the horizon. A hard school of experience begins.

当陆地消失在地平线上时，海的浪漫便不复存在了，一场艰苦的体验开始了。

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Known as the "low countries" because much of the land is now below sea level, many of the country's largest cities are kept dry only by huge walls holding back the sea.

因为大部分国土现在都低于海平面，因而成为众所皆知的“低地国”，国内有很多城市靠着墙壁挡住海水才能不被水淹。

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At more than 1,300 feet below sea level, the Dead sea's shores are the lowest spots of dry land on Earth.

低于海平面1300多尺，死海海岸是地球上陆地的最低点。

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The surface of the inland waterway sits at the lowest land point on the planet, more than 400m below sea level.

BBC: Cores reveal when Dead Sea 'died'

The US Navy has expanded the role of its destroyers and the Arleigh Burke-class of vessels is designed to launch simultaneous attacks against targets on land, in the air, at sea and below it.

BBC: News | In Depth | Military Fact Files