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重庆市中医院查激素六项多少钱

2017年12月18日 05:27:27|来源:国际在线|编辑:求医指南
Shark Bay, Western Australia, home to more than 3,000 bottlenose dolphins.澳洲西部的鲨鱼湾,3000多宽吻海豚的家园。Here, a devoted mother called Puck battles to keep her little calf Samu alive in a very dangerous world.就在这里,一位充满母爱名叫帕克的母亲为保护它的幼崽山姆而与自然界无处不在的危险搏斗。Every summer thousands of tiger sharks come to the Bay looking for an easy meal, many of the calves are taken.每个夏天,数以千计的鲨鱼会来到这里寻找易捕食的猎物。许多海豚幼崽会被吃掉。;...the shark! the shark!;鲨鱼,鲨鱼!The survival of Pucks baby calf Samu will depend on the devotion of his mom and the strength of his family.帕克的孩子幼崽山姆的存活取决于母亲对于它的爱以及整个家族的力量。For the first time the extraordinary behaviour of a family of dolphins has been captured on camera.摄像机首次捕捉到了海豚一家的奇特行为。All the drama of Samus first few months is played out in the shallow waters of Shark Bay where only the lucky few survive.山姆头几个月的戏剧生活在鲨鱼湾的浅水区上演了。在那里只有少数幸存者能够存活下来。800 miles north of Perth, a group of islands stretch out into the rough waters of the Indian Ocean, sheltering a vast shallow bay beyond.距离帕斯北部800公里处,一群岛屿坐落在波涛汹涌的印度洋中,在更远处,潜藏着巨大的浅水湾。201403/282541

Don: Ready, Yael?唐:真的吗,雅艾尔?Yael: Yep.雅艾尔:对。Don: Here goes 3.1415 9265 3589 7932 3846 2643 3832 79. Ta da!唐:听着,3.1415 9265 3589 7932 3846 2643 3832 79。哒哒!Yael: Wow, you really can recite pi to the thirtieth decimal place. Very impressive, Don! You must have the memory of an elephant.雅艾尔:哇,你真能背诵出圆周率小数点后十三位数字。唐,太令人印象深刻了! 你的肯定跟大象一样好。Don: Thanks, Yael, but do elephants really have good memories? Or is that just a saying?唐:谢谢,雅艾尔,但是大象真有很好的吗?或者这仅仅是个谚语?Yael: Oh, its real. In fact, a study on elephant memory shows that having a strong memory helps elephants survive in the wild.雅艾尔:哦,是真的。实际上,一项对大象的研究明拥有好的能帮助大象在野外存活。Don: What do you mean?唐:你是什么意思?Yael: Well, scientists studying elephants in Tanzanias Tarangire National Park in Africa knew that some elephants lived through a terrible drought from 1958 to 1961. Now cut to 1993, when theres a second severe drought. Some elephant groups left the park, but only those with members who were old enough to have possibly remembered the earlier drought. The group that stayed in the park was composed of younger elephants.雅艾尔:好吧,科学家对非洲坦桑尼亚的塔兰吉雷国家公园中的大象进行研究,了解到有些大象经历过1958年到1961年之间那次特大干旱。到1993年时,又一次严重的干旱袭来,一些大象群离开了公园,但仅仅是那些还记得之前的大干旱的老象所在的群体。留在公园的大象则是一群较年轻的大象。Don: I see. And I assume that the elephants that left the park in 1993 were better able to survive.唐:我明白了。我猜1993年离开公园的大象生存的机会更大。Yael: Right. The elephants that left the park lost only ten- percent of their calves. But the group that stuck it out lost forty-percent of its young.雅艾尔:没错。离开公园的那组大象只失去了10%的小象。而留下来的大象损失了40%的小象。Don: So in this case, at least, evolution selects for elephants that have memories strong enough to remember stuff from their childhood.唐:所以既然如此,至少大象进化选择了那些好得足以从儿时就记得事情的大象。Yael: Yep. For elephants, memory is a survival tool. 雅艾尔:是的。对于大象来说,记忆是生存工具。 原文译文属!201305/241163

Whats the matter,don?You look worried.你怎么了唐,看起来有些着急。You know how people are always predicting that one day women will be able to have babies without men?你是否曾听说过某一天女性将不需要男性也可生小孩?It turns out that some species of the Whiptail lizard have figured out how to do this and completely eliminated the male sex.事实上一些种类的长尾蜥蜴已经可以做到这一点,并将全部的雄性完全消灭掉了。You mean the species are all female?Exactly.你的意思是物种全部是雌性?的确是这样。The females have the ability to lay eggs that hatch and grow into healthy lizards without needing to be fertilized by a male.无须借助雄性受,雌性蜥蜴有能力产下可以孵化出健康的小蜥蜴的蛋。The offspring are exact and complete genetic duplicates of the mothers.其后代完全是母亲们基因的复制品。So the females are clonnig themselves.这在本质上是雌性在克隆自己。If that werent enough, the female lizards take turns role-playing.如果这还不够的话,雌性蜥蜴会轮流扮演角色。They perform a mating ritual in which one lizard acts like the male, and the second lizard acts like the female.她们在交配过程中,一只扮演雄性,另一只扮演雌性。The ritual causes the lizard acting as the female to ovulate and lay her eggs.交配将使扮演雌性的蜥蜴排卵产蛋。Then, a few weeks later, the two lizards switch roles and repeat this process so that the second female will be able to ovulate and lay her eggs.几周之后,两只蜥蜴互换角色重复交配过程从而使得另一只雌性得以排卵。It raises a lot of interesting questions.这引发了许多有意思的问题。For example, its not clear how well an all female species can evolve and adapt to environmental changes.例如,我们尚不清楚一个完全由雌性组成的种群在面临环境变化是能否很好地适应和进化。A species survival depends in part on variation among its members.一个种群的存在,部分地取决于其内部成员的多样性。If all the members of a species are identical, chances are greater that something like a change in the climate or a disease will wipe them all out.如果一个种群中所有的成员具有同一性,那么当环境剧变或疾病肆虐时,它们的灭绝概率也将更大。 /201309/256998

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