在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 英語短文 » 正文

經典背誦短文Evolution of sleep

放大字體  縮小字體 發布日期:2007-12-04
核心提示:Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. there is some evidence that the two types of sleep, dreaming and dre


    Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. 

    there is some evidence that the two types of sleep, dreaming and dreamless, depend on the life-style of the animal, and that predators are statistically much more likely to dream than prey, which are in turn much more likely to experience dreamless sleep. In dream sleep, the animal is powerfully immobilized and remarkably unresponsive to external stimuli. Dreamless sleep is much shallower, and we have all witnessed cats or dogs cocking their ears to a sound when apparently fast asleep. The fact that deep dream sleep is rare among pray today seems clearly to be a product of natural selection, and it makes sense that today, when sleep is highly evolved, the stupid animals are less frequently immobilized by deep sleep than the smart ones. But why should they sleep deeply at all? Why should a state of such deep immobilization ever have evolved? 

    Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in genera seem to sleep very little. There is, by and large, no place to hide in the ocean. Could it be that, rather than increasing an animal’s vulnerability, the University of Florida and Ray Meddis of London University have suggested this to be the case. It is conceivable that animals who are too stupid to be quite on their own initiative are, during periods of high risk, immobilized by the implacable arm of sleep. The point seems particularly clear for the young of predatory animals. This is an interesting notion and probably at least partly true.

 

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關鍵詞: Evolution of sleep
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 6.118 second(s), 1033 queries, Memory 3.87 M
主站蜘蛛池模板: 伊人久久成人 | 亚洲日本在线观看视频 | 国产精品夜夜春夜夜爽久久 | 天堂中文在线最新版地址 | 狼色视频在线观免费观看 | 国产小视频在线看 | 日本口工全彩无遮拦漫画大 | 国产小视频在线免费 | 午夜性福利 | 男人j进人女人j 的视频 | 成年美女 | 天天干人人干 | 色天使色婷婷丁香久久综合 | 在线精品91青草国产在线观看 | 欧美xxxxbbbb | 26uuu另类欧美亚洲曰本 | 久久精品免视看国产成人2021 | 韩日色图 | 国产伦一区二区三区免费 | 久久久综合视频 | 国产亚洲美女 | 张柏芝三级无删减在线观看 | 欧美高清性色生活 | 亚洲综合激情另类专区 | 国产乱码精品一区二区三区四川人 | 韩漫免费网站无遮挡羞羞漫画 | 一级毛片免费全部播放完整 | 蜜桃五月天 | 午夜 在线播放 | 亚洲hh| 欧美午夜在线视频 | 国内视频一区二区 | 国产精品欧美一区二区 | 四虎国产成人亚洲精品 | 国产精品乳摇在线播放 | 四虎永久在线精品视频免费观看 | 国色天香精品亚洲精品 | 在线观看一区二区三区四区 | 亚洲成成品网站有线 | 天堂资源在线官网资源 | 在线亚洲综合 |