其他的漂浮城市可以建在开阔的海洋里。
在从冰下的固体物质中收集的样本中，他们发现微型海洋植物的化石，这表明这个区域曾经是开阔的海洋而不是坚硬的冰。
Within samples collected from the solid substances lying beneath the ice they found fossils of microscopic marine plants which suggest that the region was once open ocean not solid ice.
研究人员发现，在两极附近的水域和热带地区浮游植物的跌幅最为显著，在开阔的海洋也是如此。
The researchers found the most notable phytoplankton declines in waters near the poles and in the tropics, as well as the open ocean.
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