英文书摘精选 海洋生物有趣的睡觉习惯
时间：2018-12-28 作者：英语课 分类：初学者听力文摘精选
Marine 1 Animals Have Interesting Sleeping Habits
海洋生物有趣的睡觉习惯
Many people know that marine mammals, like whales, porpoises 2 and dolphins, breathe air, like we do. But, many people don’t know that marine mammals have developed some interesting sleeping habits in order to accommodate their regular trips up to the surface for air. Today, A Moment of Science looks at what its like to sleep with the fishes.
大多数人都知道些海洋哺乳动物，比如鲸鱼，鼠海豚和海豚。它们和我们一样都要呼吸空气。但是大多数人都不知道这些哺乳动物已经养成了一些有趣的睡眠习惯，以配合来回水面呼吸空气。今天，科学一刻将探究一下，这些哺乳动物是如何像鱼类一样睡觉的。
No Sleep Tonight
今夜无眠
Unlike our own breathing, which does not require conscious effort, marine mammals must consciously go to the surface of the water to breathe through a blowhole on top of their heads. Because of this, marine mammals don’t sleep for a solid 8 hours a night, the way we do.
与人类“无意识”呼吸不同，这些动物必须到水面，通过头顶的气孔，进行“有意识”的呼吸。因此，它们不像我们，每晚能够稳定的睡上八小时。
Some marine mammals sleep while swimming. Whales nap for brief periods while swimming alongside an alert friend who guides them. In fact, young whales must sleep alongside their mother because the mother’s slipstream actually pulls the calf 3 along: it will sink if the mother stops.
有些海洋哺乳动物边睡觉边游动。对于鲸鱼，只要有同伴放风，并引导着，他们就会边游边打会个盹。实际上，幼鲸必须在母鲸身边睡觉，因为母鲸游动时产生的水流可以推动幼崽向前：如果母鲸停止游动，幼崽就会沉下去。
Dolphin
海豚
Other marine mammals, like dolphins, sleep while floating on the surface of the water or take short catnaps while floating below the surface. Researchers claim that while marine mammals sleep their brain is always partially 4 alert. Aside from these brief naps, dolphins are active most of the night.
而其它海洋哺乳动物，像海豚，睡觉的时候是浮在水面上，打盹的时候就浮在水面下。研究表明，海洋哺乳动物睡觉时，他们部分大脑依然保持警觉。海豚在晚上，除了打盹，其余时间都处于活跃状态。
Of course, marine mammals are equipped to handle underwater sleeping. They have proportionately larger lungs, exchange air more fully 5 at each breath, and carry more oxygen in their blood than we do, so they can hold their breath long enough to sleep with the fishes.
当然，也有些海洋哺乳动物具备水下睡觉的能力。相应地，他们的肺都很大，每次呼吸都能换进更多的空气。他们的血液中的含氧量就比我们的高，这样他们就能长时间屏息，像鱼类一样睡觉。
- Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
- When the war broke out,he volunteered for the Marine Corps.战争爆发时，他自愿参加了海军陆战队。
- A shoal of porpoises are well on the feed. 一群海豚正在吞食。 来自辞典例句
- In 1928 some porpoises were photographed working like beavers to push ashore a waterlogged mattress. 1928年有人把这些海豚象海狸那样把一床浸泡了水的褥垫推上岸时的情景拍摄了下来。 来自辞典例句
- The cow slinked its calf.那头母牛早产了一头小牛犊。
- The calf blared for its mother.牛犊哞哞地高声叫喊找妈妈。