Since the disappearance of sea urchins from the waters up the coast of South Florida, many coral reefs there have been smothered by the uncontrolled growth of algae.

自从海胆从南佛罗里达海岸的海水中消失后，那里有许多珊瑚礁被不受控制生长的藻类所扼杀。

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Over geologic time the central volcano becomes extinct, followed by erosion and subsidence beneath the sea surface, leaving the coral reefs as a ring around (or cap on) the submerged island remnant.

由于侵蚀和海底的下沉，经过地质时代的变迁，中心的火山已经不见踪影，而只留下珊瑚礁环绕或覆盖在沉入海底的火山岛上。

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Kapalua's white coral sand is protected by two headlands, formed by ancient lava flows into the sea.

很久以前的岩浆流入大海形成了两个岬，而这两个岬保护着卡帕·鲁亚湾的白珊瑚沙。

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Barrier reef: a coral reef separated from the land by a large lagoon or, in some cases, by several kilometres of open sea.

UNESCO: L O S S A R Y

Even the beach is not what it seems: the coral reefs stretch from the shore far out to sea, and although Egyptian laws protecting the reefs are regularly violated by developers who bulldoze their way through reefs, tourists may find they have to pick their way for some distance over the delicate sharp reefs, damaging both them and their feet, to find deep water.

ECONOMIST: For a tourist, Egypt can be either