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赣州华兴肛肠看大便出血多少钱最新新闻

2017年11月22日 01:07:20|来源:国际在线|编辑:快乐大夫
Don: Today on ;A Moment of Science,; herring make sounds when passing gas...唐:今日科学时刻,鲱鱼放屁时会发出声音...Yael: Don, be serious!雅艾尔:唐,正经点!Don: I am serious, Yael! The Atlantic herring is one of the most abundant fish on Earth!The silvery foot-long fish live in huge schools of thousands to hundreds of thousands of individuals.唐:我很正经啊,雅艾尔!大西洋的鲱鱼是世界上数量最多的鱼类之一!这种银白色的长足鱼成群而居,每一群都有成百上千条鲱鱼。Fishermen have long known that herring schools can release large clouds of bubbles that are visible from the surface. The bubbles are released through the anal opening, connected to the fishs swim bladder.人们早就知道鲱鱼群会吐出巨大的从水面都能看见的气泡云。这些气泡来自于鱼鳔,通过释放。Yael: Whats a swim bladder?雅艾尔:什么是鱼鳔?Don: Its a special, gas-filled organ that helps regulate buoyancy. Herring gulp air at the surface and store it in their swim bladders. Its also long been known that herring make chirp-like sounds, especially when startled or in danger, but biologists didnt know how these chirps were produced.唐:它是一种特殊的充满气体的器官,有助于调节鱼体的浮力。鲱鱼在水面大口吸气,把氧气存在鱼鳔里。很早以前人们也知道鲱鱼会发出类似啾啾的声音,尤其在受到惊吓或者遇到危险时。但那时生物学家们并不知道这种啾啾声是如何产生的。Yael: I think I know where this is heading!雅艾尔:我大概知道接下来你要说什么了!Don: Yep! A pair of Danish biologists recorded herring housed in special pressurized tanks that replicated conditions at the ocean depths where herring are found. They discovered that the chirping sounds were actually produced by air release from the swim bladder during the bubble production—the first report of sound production by gas release in fishes.唐:没错!两位丹麦生物学家研究记录了一群鲱鱼,为了仿造了鲱鱼出没的深海环境,他们把鲱鱼养在特殊增压箱里的。他们发现啾啾声实际上是在鱼鳔释放气体,产生气泡时发出的,这是人类第一个有关鱼类释放气体发声的报告。Yael: So the chirps are just a by-product of passing gas?雅艾尔:所以说啾啾声只不过是放屁时的意外收获?Don: That is whats intriguing scientists, since the bubbles are released by the fish in response to stress, and occur whether the fish are ascending or descending, they dont think that its simply part of controlling buoyancy.唐:这正是令科学家们振奋的原因。鱼体受到压力作用,就会释放气泡,当浮起或下沉时也会这样,他们不认为这仅仅是为了控制浮力。Some scientists speculate that the sound and bubbles might work as a visual and acoustic screen to confuse predators, but more studies are needed to determine if the chirping bubbles have a behavioral function or not. 一些科学家们推断,鱼类在利用声音和气泡形成有视听效果的屏障,来迷惑捕食者。但是要确定啾啾声和气泡是否具有行为功能还需要进一步的研究。201206/185781We may go to Mars and learn things that may be incredibly important to those who are still here on earth. We never know unless we go and explore.我们也许会登录火星,了解对地球,对万物都十分重要的事情。只有去探索,否则永远不会知道。Mars is the test of whether life naturally evolves from chemistry where ever you have the right physical and chemical conditions. That will mean the universe is filled with life. We can prove this by going to Mars.火星是一场检测生命是否通过化学反应自然进化而来的实验。化学反应既能创造物理条件,也能创造化学条件。这也意味着宇宙之大,处处皆生命。我们可以通过登录火星来明这一点。Chris Mckay is a planetary scientist at NASAs Ames research center in California. Robert Zubrin is President of the Mars Society. Both believe that there may have once been some form of life on Mars.克里斯·麦克凯伊是美国宇航局艾姆斯研究中心的行星科学家。罗伯特·祖布林是火星协会主席。两人都相信火星上曾有生命存在。One of the components of life as we know it is water. NASA probes have concluded that there is ice on the planet poles and there appears to be liquid water just below the planets surface.我们知道生命的组成成分是水。NASA探测器在火星两极探测到冰层,似乎在火星地表以下也发现了液态水。Mars today is a polar desert. There is water on Mars but its all frozen into the soil as ice or permafrost.如今的火星是极地沙漠。火星上虽有水,但被冻结到土壤里,变成冰或者永久冻土。We know that early in Mars history it had water, we think it had life. That opens up the question of bringing it back to life, making Mars in the future more like earth is now. This is sometimes called terraforming. The basis of terraforming is the notion that early in Mars history it had life and its recently dead. Recently for Mars means a couple of millions years.我们知道早期的火星上有水,有水就有生命。这就打开了将生命重新带回火星这一问题。改造火星,使它更像地球,有时称之为地造。地造的基础在于早期的火星有生命,近年来生命才绝迹这一理念。对火星来说近年来就是上百年。Mckay believes that after all that time life could actually be revived on Mars. The fundamental problem in bringing Mars back to life is warming it up. Mars is too cold.麦克凯伊认为经过漫长的岁月,火星可以重燃生命。让火星重现生机的根本性问题在于让火星变暖,因为火星上十分严寒。Meanwhile, because of global warming, the atmosphere on our own planet is getting too hot. We humans have learned how to warm our planet. Were doing it on earth with super green house gases.然而,因为全球气候变暖地球的环境温度日益升高。人类知道怎样将地球变暖。我们释放温室气体来使地球变暖。原文译文属!201208/194046

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