We travel around the five Continents on a small stamp, and we also pray for peaceful navigations across the four Oceans in the world.

我们在方寸间遨游五洲，也让这个世界在四大洋平静航行。

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The Marine reptile hunted the oceans with a long thin neck and tail, four large flippers and razor-sharp teeth.

这种海洋两栖动物长有细细的长脖颈和细长尾巴，四个巨大的阔鳍，像剃刀一样锋利的牙齿，以捕食其他海洋动物为生。

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An estimated four thousand types of forams live in the world's oceans.

据估计，在海洋中生活着4000种有孔虫。

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There is more heat stored in the top four metres of the oceans than in all the Earth's atmosphere.

ECONOMIST: Britain��s cold snap is explained by the Arctic oscillation

Unless something is done to reverse the decline in Europe's fish stock, the oceans here will be as devoid of life as deserts are in just four decades from now, President Grimsson said.

BBC: Davos 2013: Iceland slams Europe over fishing policy

Because of the distance that low-frequency sound waves can travel under water, a set of four ships emitting sound at 235 decibels could monitor 80% of the world's oceans for submarines.

ECONOMIST: The American navy may soon have a whale of a problem