Just as the relentless movement of water in rivers and streams can smooth the jagged edges of rocks over time, ocean currents can smooth ice fragments into round shapes.

奔流不息的河水，随着时间流逝，能够将边缘锋利的石头打磨光滑，与此类似，洋流也可以将冰块的边缘打磨圆润。

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But since it has been largely covered with year-round ice throughout modern history, it is the least mapped ocean.

但是由于在人类现代史上北冰洋大部分地区始终是终年冰雪覆盖，因而它也是各大洋中最疏于勘查的。

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Dr Venter then went on a round-the-world cruise on his yacht, collecting bacterial samples from the sea for a project he dubbed the Global Ocean Sampling Expedition.

随后他乘坐自己的游艇周游世界，从海水中收集细菌样品以完成被他称为全球海洋样品考察的计划。

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In January 1977, in company with Ethel Johnson Meyers, he went round 112 Ocean Avenue in Amityville, Long Island.

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The British government trumped him by creating the world's biggest single marine reserve round the Chagos islands in the Indian Ocean - all 545, 000 sq km of it.

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For someone who had never gone faster than 8 knots on a sailboat, watching him and his crew in the 1989 Whitbread Round-the-World Race blaze through the Southern Ocean on the 90-foot Steinlager II was nothing short of incredible.

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