一些科学家推测，火星在早期很长时间里可能都有以河流、湖泊，甚至海洋装点着它的表面。
Some scientists speculate that Mars may have enjoyed an extended early period during which rivers, lakes, and perhaps even oceans adorned its surface.
四分之一的海洋物种在珊瑚礁中度过了它们一生中至少一半的时间，而且很多珊瑚礁处于寒冷或温和的水中。
A quarter of all sea species spend at least a part of their life in a reef and many reefs are in cold or temperate waters.
在20年的绝大部分时间里，我一直在撰写和谈论太空飞行，突然将兴趣转向海洋深处，确实显得很奇怪。
As I have been writing and talking about space flight for the best part of 20 years, a sudden switch of interest to the depth of the sea does seem peculiar.
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